T  A  B  L  p]  S 


FOK  OBTAINING 


THE  TEMPERATURE  OF  THE  DEW-POINT, 

RELATIVE  HUMIDITY.  AND 

VAPOR  PRESSURE. 


PREPARED      FOR      USE 


UNITED  STATES  SIGNAL  SERVICE. 


WASHINGTON  CITY: 

SIGNAL    OFFICE, 

1889. 


TABLES 


FOR  OBTAINING 


THE  TEMPERATURE  OF  THE  DEW-POINT, 

RELATIVE  HUMIDITY,  AND 

VAPOR  PRESSURE. 


PREPARED     FOR     USE 


IN  THE 


UNITED  STATES  SIGNAL  SERVICE. 

* 

<5Awx\  c*\,»c*^ 


WASHINGTON  CITY : 

SIGNAL    OFFICE, 

1889. 


UNITED  STATES  SIGNAL  SERVICE  DEW-POINT, 

RELATIVE  HUMIDITY,  AND  VAPOR 

PRESSURE  TABLES. 

The  following  tables  are  published  for  the  use  of  the  observers  of  the 
Signal  Service  and  other  co-operating  observers,  to  be  used  on  and 
after  July  1,  1889. 

Use  of  the  tables. 

The  psychrometric  formula  below,  and  the  tables  based  upon  it,  are 
for  use  in  obtaining  the  dew-point  and  relative  humidity  from  readings 
of  the  dry  and  wet  thermometers.  These  tables  are  strictly  applicable 
to  roof  shelters  and  the  whirled  psychrometer,  but  may  be  used  with- 
out much  error  for  all  shelters  fairly  well  ventilated.  The  formula 
(Ferrel's)  is  as  follows: 

p  =  p'  —  0.000367  P  (t  —  t')  fl  +  "      In  which> 


p  =  vapor  pressure  of  saturation  at  the  dew-point  temperature. 
p'  —  vapor  pressure  of  saturation  at  the  wet-bulb  temperature. 
P  •=.  barometric  pressure. 
t  =.  dry  thermometer. 
tf  ==  wet  thermometer. 

Having  given  t  and  tr  ,  the  values  of  dew-point  and  relative  humidity 
at  29.4  inches  pressure  (chosen  because  it  is  the  mean  pressure  for  all 
stations)  may  be  immediately  taken  from  the  tables. 

Example. 

Given  t  =.  60°;  t  —  V  =  12°.  Entering  the  table  on  page  6,  with 
t  =  60°  and  t  —  t'  =  12°,  we  find  the  dew-point  =  35°  ;  and  on  page 
16  the  relative  humidity  —  39  per  cent. 

There  is  a  small  correction  to  be  applied  to  these  values,  if  great 
refinement  is  required,  at  pressures  greater  or  less  than  29.4  inches. 
This  may  be  obtained  by  the  use  of  the  table  on  page  24  in  connection 
with  the  vapor  pressure  given  on  page  23.  Having  found  the  dew- 
point,  determine  the  vapor  pressure  corresponding  to  that  dew-point. 
Then  in  the  table  on  page  24,  with  the  air  pressure  and  t  —  $',  find 
the  correction  to  this  vapor  pressure.  Find  the  dew-point  correspond- 
ing to  this  corrected  vapor  pressure  from  the  table  on  page  23,  and 
with  the  corrected  dew-point  find  the  proper  relative  humidity. 

Example. 

Given  P  =.  27  inches  ;  t  —  60°  and  V  =  48°.  The  table,  as  above, 
gives  the  dew-point  35°.  The  vapor  pressure  corresponding  is  .203  of  an 
inch  ;  correction  from  the  table  on  page  24  for  P=:  27  inches  and  t  —  t' 
=  12°  is  -f-  .010.  Vapor  pressure  corrected  ,  •=.  .213  ;  corresponding 
dew-point,  =  36°. 

Each  page  of  the  relative  humidity  table  is  ten  pages  ahead  of  its 
corresponding  page  of  dew-points.  The  dew-point  36°,  corrected  for 

368376 


barometric  pressure,  on  page  6,  is  ona  line  lower  than  the  dew- 
point  originally  found.  The  corresponding  line,  on  page  16,  under  the 
12°  heading,  gives  the  corrected  relative  humidity  40  per  cent. 

For  an  observation  falling  outside  the  limits  of  the  table,  the  nearest 
values  to  the  observations  in  the  tables  will  be  taken  as  the  dew-point 
and  relative  humidity.  For  example,  for  a  reading  of  the  dry  ther- 
mometer of  44°  and  a  difference  of  the  dry  and  wet  thermometers  of 
15°.0,  there  being  no  values  given  in  the  table  for  15°.0  those  for  a 
difference  of  14°. 5  will  be  taken.  The  dew-point  and  relative  humidity 
will  therefore  be  recorded  as  — 42°  and  2  per  cent. 

The  values  of  the  vapor  pressures  down  to  — 58°  Fahrenheit  used  in 
computing  these  tables  were  obtained  by  means  of  Broch's  formula, 
which  is  based  on  Regnault's  observations.  The  lowest  temperature 
at  which  Kegnault  observed  vapor  pressure  was  about  — 27°. 

In  the  series  of  observations  from  which  the  constants  for  the  psy- 
chrometric  formula  given  above  was  derived,  the  lowest  dry  thermome- 
ter temperature  observed  was  6°. 4  Fahrenheit. 

A.  W.  GREELY, 

Chief  Signal  Officer. 
SIGNAL  OFFICE,  WASHINGTON  CITY, 

July  1,  1889. 


Temperature  of  the  dew  point,  in  degrees  Fahrenheit. 


•K>  "** 

Difference  between  the  dry  and  wet  thermometers  (t  —  t'). 

1 

5 

00.2 

o°-4  !  o°.6 

o°.8 

10.0 

10.2 

.".4 

'°'6 

10.8 

2°.0 

2°.  2 

2°-4 

2°.  6 

| 

—40 

—49 

|j 

—40 

—47 

g 

(t-f) 

—39 

—  •ig 

-46 

"*°  t>* 

-38 

-37 

—44 

-56 

i 

O°.  I 

0°.2 

—37' 

-36 

—43 

—53 

^_ 

-36 

—35 

—41 

-50 

_ 

eg 

-35 

—34 
—33 
—32 
-31 

—40 
—39 
—37 
-36 

—48 
-46 
—44 
—42 

—57 
i  -53 

—49 
—  48 
—47 
-46 

-56 

—54 
—53 
—51 

—34 
—33 
—32 

—30 

—29 

—28 
—27 
—26 

—35     -4i 
—34     —39 
-32     -37 
—31     —36 
—30     —35 

-50 
-48 
—45 
—43 
—41 

-58 
—53 
—50 

—45  1  —50     —58 
—44  |  —48  I  '—55 
—43     —47     —53 
—42     —46  i  —52 
—41      —45     —51 

—30 
-29 
—28 
—27 
-26 

—24 

—28 

O't- 

—33 

-37 

—44 

-56 

—24 

—23 

—26 

—30 

—35 

—41 

j 

—23 

—  22 

-25 

—29 

—33 

-39 

-48 

—  22 

—21 

—24 

—27 

—32 

—37 

-44 

—  21 

—  2O 

—23 

—  26 

—30 

—35 

—41 

—  2O 

—19 

—  22 

—25 

-29 

—33 

—39 

—47 

—19 

—  18 

—  21 

—24 

—27 

—3i 

—37 

—44 

—  18 

—17 

—  20 

—  22 

—26 

—34 

—40 

—49 

—17 

—  16 

—  18 

—21 

—24 

—28 

—32 

-38 

—45 

—  16 

—15 

—  17 

—  2O 

—23 

—26 

—3° 

—35 

—41 

—52 

j 

—15 

—14 

—  16 

—  19 

—  22 

-25 

-28 

-33 

-38 

—47 

—H 

—13 
—-la 

-'4 

IS 

—  20 

-      *Q 

—23 

—  21 

—26 
—24 

—3° 

—28 

-36 
—33 

—42 
—39     —47 

—13 

—  12 

—  ii 

—13 

—15 

—  18 

—2O 

—26 

—30 

-36 

—43 

—II 

—  10 

—  12 

—  14 

-16 

—  19 

—  22 

—25 

-28 

—33 

—38 

—47 

—  10 

—  Q 

—  II 

-13   —15 

—17 

—  2O 

—23 

—26 

—35 

—42 

—  9 

—  8 

—  IO 

—  12 

—14 

—  16 

—19 

—  21 

—25 

—28 

—  32 

—38  !  -47 

—  8 

—  7 

—  9     —  10 

—  12 

—15 

—17 

—  20 

—23 

—26 

—29 

—35  |  —4i  , 

—  7 

—  6 

—  8 

—  9 

—  II 

—13 

—15 

—  18 

—21 

—24 

-27 

"-3i     —37  :  —45  i 

—  6 

—  5 

—  7 

Q 

—  IO 

—  12 

—  14 

—  16 

—  19 

—  22 

-25 

—29 

—33     —39     —49 

_  5 

—  3 

—  5 

—  4 

-I 

—  9 

—  8 

—  II 

—  II 

-15 
—13 

—17 

—  16 

—  20 

—  18 

—23 

—  21 

—26 
—24 

—3°  i  —35     —43 
—27  ;  —32    —38 

—  4 
—  3 

—  2 

—  3 

—  5 

—  6 

—  8 

—10 

—  12 

—  *4 

—  16 

—  19 

—  22 

—25  :  -29     -34 

—   2 

~    J 

—   2 

—  4 

—  5 

~  7 

—  9 

—  10 

—  12 

—15 

~X7 

—  2O 

—23     —26 

—30 

—    I 

O 

I 

—   I 
O 

—  3 

—   2 

—  4 
—  3 

—  6 
—  4 

-I 

=  1 

—  II 

—13 
—  ii 

—15 
—13 

—  18 
—  16 

i 

—  21    i    —  24 

—  18  ;  —2i 

—28 
—25. 

O 
I 

2 

4-  i 

0 

—   2 

—  3 

—  5 

—  6 

—  8 

—  IO 

—  12 

—14 

—  16  i  —  19 

—22 

2 

3 

2 

+    I 

—    I 

—  3 

—  5 

—  6 

—  8 

—  IO 

—  12 

—14 

—17     —20 

3 

4 

3 

2 

0 

—  i 

—  2 

—  4 

—  5 

-  7 

—  8 

—10 

—13 

—15  i  —17 

4 

5 

4 

3 

+  2 

o 

—   I 

—    2 

—  4 

—  5 

—  7 

—  9 

—ii 

—13     —15 

5 

6 

5 

4 

3 

+  2 

O 

—    I 

—   2 

—  4 

—  5 

—  7 

—  9  |  —ii 

—  13 

6 

7 

6 

5 

4 

3 

4-  i 

0 

—    I 

—   2 

—  4 

—  6 

—  7     -  9 

—  II 

7 

8 

7 

6 

5 

4 

3 

+  2 

'  O 

—    I 

—  3 

—  4 

-6  |  -7 

—  9 

8 

9 

8 

7 

6 

5 

4 

3 

+  2 

O 

—  i 

—  3 

—  6 

—  8 

9 

10 

9 

8 

7 

6 

5 

4 

3 

4-  2 

0 

—   ! 

—  3 

—  4 

—  6 

10 

ii 

10 

9 

8 

7 

6 

5 

4 

3 

4-2 

0 

—  i 

—   2 

—  4 

II  . 

12 

ii 

10 

9 

8 

7 

6 

5 

4 

3 

+  2 

0       —    I 

—  3 

12 

13 

12 

ii 

IO 

9 

9 

8 

7 

5 

4 

3 

4-2+1 

—  i 

13 

14 

13 

12 

12 

II 

10 

9 

8 

7 

6 

5 

3              2 

0 

14 

15 

14 

13 

13 

12 

ii 

10 

9 

8 

7 

6 

5           4 

4  2 

15 

16 

15 

14 

14 

13 

12 

ii 

IO 

9 

8 

7 

6 

5 

3 

16 

17 

16 

16 

15 

14 

13 

12 

ii 

10 

9 

8 

7 

6           5 

17 

18 

17 

17 

16 

15 

14 

14 

'3 

12 

ii 

IO 

9 

8           6 

18 

19 

18 

18 

17 

16 

15 

IS 

H 

13 

12 

ii 

10           9  !        8 

19 

20 

19 

19 

18 

17 

16 

16 

15 

14 

13 

12 

12   j         IO   1           9 

20 

t 

0°.2 

o°.4 

o°.6 

o°.S 

I'.O 

..., 

-.4 

10.6 

,°.8 

2°.0 

2°.  2 

2°.  4 

2°.  6 

t 

Temperature  of  the  dew  point,  in  degrees  Fahrenheit. 


to  +* 

Difference  between  the  dry  and  wet  thermometers  (t—f  ). 

1 

Q 

2°.  6 

2°.  8 

3°-o 

3°.  2 

3°-  4 

3°.  6 

3°.  8 

4°.o 

4°.2 

40.4 

5 

—    2 

—34 

—39 

—49 

—   2 

—    I 

-30 

—35 

—42 

—    I 

0 

—27 

—31 

-37 

—45 

O 

I 

—25 

—28 

—32 

—39 

-48 

I 

2 

—  22 

—25 

—29 

—34 

—40 

—54 

2 

3 

—20 

—23 

—  25 

—30 

—35 

—42 

—54 

3 

4 

—17 

—  20 

—  24 

—26 

—30 

-36 

—44 

4 

5 
6 
7 

—15 
—13 
—  II 

—  18 
—  16 
—13 

—  21 

—  18 
—  16 

—25 

—22 

—  19 

—27 
—23 

—22 

—27 

—24 

—37 

-S 

-46 

-38 
—33 

-48 
—39 

—49 

65 

7 

8 

—  9 

—  ii 

-13 

—  16 

—  19 

—  22 

—24 

—28 

—33 

—40 

8 

9 

—  8 

—  9 

—  ii 

—14 

—  16 

-19 

—  21 

—24 

—28 

—33 

9 

10 

—  6 

-  7  i  -  9 

—  12 

—14 

—  16 

—19 

—21 

—24     -28 

10 

ii 

—  4     —  6     —  7 

—10 

—  12 

—  14 

—  16 

—19 

—  21       —  24 

ii 

12 

—  3 

—  4  i  -  6 

—  8 

—  9 

—  II 

—14 

-16 

—  18     —21 

12 

13 

—  i 

—  2     —  4 

—  6 

—  9 

—  ii 

-13 

—  16 

—19 

13 

14 

o 

—    1—2 

—  4 

—  5 

—  7 

—  9 

—  ii 

—13 

—  16 

H 

15 

4-24-1         o 

—   2 

-  3 

-  5 

—  7 

—  9 

—  ii 

—13 

15 

16 

3 

2J4-I 

O 

—   2 

-  3 

—  5 

—  6 

-  8 

—  10 

16 

17 

5 

4           3 

4-  2 

O 

—  i 

—  3 

-~  4 

—  6 

—  8 

17 

18 

6 

5          4 

3 

4-2 

4-  1 

—  i 

—  2 

—  4 

—  6 

18 

19 

8 

7          6 

5 

4 

2 

4-i 

O 

—   2 

—  4 

19 

20 

9 

8  !        7 

6 

5 

4 

3 

+   I 

O 

—  i 

20 

i 

2o.6 

2o.8 

3o.0 

3°-2 

3°-4 

3o.6 

3°.  8 

4°.0 

4°.2 

4°-  4 

t 

e 

4°.  6 

4°.  8 

5o.0 

5°-2 

5°-4 

5°-6 

5°.  8 

6°.o 

60.2 

60.4 

t 

8 

—50 

8 

9 

—40 

-52 

9 

10 

—34 

—41 

—52 

10 

ii 

—29 

—34 

—41 

-53 

ii 

12 

—24 

-29 

-34 

—41 

—53 

12 

13 

—20 

—24 

—28 

—34 

—40 

—52 

13 

14 

—17 

—20 

—24 

—28 

-32 

—40 

-51 

14 

15 

—14 

—17 

—  20 

—23 

—27 

—33 

—39 

—50 

I5 

16 

—  12 

—  14 

—  16 

—19 

—  22 

—27 

—32 

—  38 

—49 

16 

17 

—10 

—  II 

-13 

—  16 

--18 

—22 

—26 

—3i 

-38 

—47 

17 

18 

—  8 

—  10 

—  ii 

—13 

—15 

—  18 

—  21 

—30 

-36 

18 

19 

—  5 

—  7 

—  9 

—  10 

—  12 

—15 

—17 

—21 

-25 

—29 

19 

20 

3 

-5 

—  6 

—  9 

—  9 

—  12 

—14 

—  17 

—20 

-23 

20 

t 

4°.6 

4°.  8 

5°-o 

5°.  2 

5°-  4 

5°-6 

50.8 

6°.o 

6°.  2 

60.4 

t 

Temperature  of  Ike  dew  point,  in  degrees  Fahrenheit. 


^ 

o> 

A 

Difference  between  the  dry  and  wet  thermometers  (t  —  /'  ). 

10  >J 

| 

>°  >. 

5 

o°-5 

i°.o 

i°.5 

2°.0 

2°.  5 

3°-o 

3°-5 

4°-o 

4°-  5 

50.0 

5°-  5 

6°.o 

s 

20 

18 

16 

14 

12 

9 

7 

4 

i 

-  3 

-  7 

-13 

-17 

20 

21 

19 

18 

16 

H 

ii 

9 

6 

3 

—  i 

—  4 

—  10 

—15 

21 

22 

20 

19 

17 

15 

12 

10 

7 

5 

+  i 

—  2 

—  7 

—12 

22 

23 

21 

20 

18 

16 

14 

12 

9 

6 

3 

O 

—  5 

—  9 

23 

24 

22 

21 

19 

17 

15 

13 

10 

8 

5 

+  2 

—  2 

—  6 

24 

25 

23 

22 

20 

18 

16 

14 

12 

10 

7 

4 

0 

—  3 

25 

26 

24 

23 

21 

20 

18 

16 

13 

ii 

8 

6 

~t~  2 

—  i 

26 

27 

25 

24 

22 

21 

19 

17 

15 

13 

10 

8 

4 

-4-  i 

27 

28 

26 

25 

23 

22 

20 

18 

16 

14 

ii 

9 

6 

3 

28 

29 

27 

26 

24 

23 

21 

20 

18 

16 

13 

ii 

8 

5 

29 

& 

28 

27 

25 

24 

22 

21 

19 

17 

I5 

13 

10 

7 

30 

31 

29 

28 

26 

25 

23 

22 

20 

19 

16 

H 

ii 

9 

31 

32 

30 

29 

28 

27 

25 

23 

21 

20 

18 

16 

13 

ii 

32 

33 

31 

30 

29 

28 

26 

25 

23 

21 

19 

17 

15 

13 

33 

34 

32 

31 

3° 

29 

27 

16 

24 

23 

21 

19 

16 

H 

34 

35 

33 

32 

31 

30 

28 

27 

25 

24 

22 

20 

18 

16 

35 

3P 

35 

34 

32 

31 

29 

28 

26 

25 

23 

22 

20 

18 

36 

37 

36 

35 

33 

32 

30 

29 

27 

26 

24 

23 

21 

19 

37 

3* 

37 

36 

34 

33 

32 

31 

29 

28 

26 

24 

22 

21 

38 

39 

38 

37 

35 

34 

33 

32 

3° 

29 

27 

26 

24 

22 

39 

40 

39 

38 

36 

35 

34 

33 

31 

30 

28 

27 

25 

24 

40 

41 

40 

39 

37 

36 

35 

34 

32 

31 

29 

28 

26 

25 

42 

41 

40 

39 

38 

36 

35 

34 

33 

31 

29 

27 

26 

42 

43 

42 

41 

40 

39 

37 

36 

35 

34 

32 

31 

28 

28 

43 

44 

43 

42 

4i 

40 

38 

37 

36 

35 

33 

32 

30 

29 

44 

M 

44 
45 

43 
44 

42 
43 

42 

40 

39 
40 

38 

36 
37 

34 

36 

33 
35 

31 

33 

32 

i 

47 

46 

45 

44 

43 

42 

41 

40 

39 

37 

36 

34 

33 

47 

48 

47 

46 

45 

44 

43 

42 

41 

40 

38 

37 

36 

35 

48 

49 

48 

47 

46 

45 

44 

43 

42 

41 

39 

38 

37 

36 

49 

50 

49 

48 

47 

46 

45 

44 

43 

42 

4i 

40 

38 

37 

50 

50 

49 

48 

47 

46 

45 

44 

43 

42 

39 

38 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

40 

52 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

53 

54 

53 

52 

50 

50 

49 

47 

46 

45 

44 

43 

42 

54 

55 

54 

53 

53 

52 

5I 

50 

49 

48 

47 

46 

44 

43 

55 

56 
57 

54 
55 

54 

53 
54 

52 
53 

52 

50 

49 
50 

48 
49 

% 

45 
47 

44 
46 

57 

58 

57 

56 

56 

55 

54 

53 

52 

50 

49 

48 

47 

58 

59 

58 

57 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

,   59 

60 

59 

58 

58 

57 

56 

55 

54 

53 

52 

5I 

50 

49 

60 

61 

60 

59 

59 

58 

57 

56 

54 

53 

52 

50 

61 

62 

61 

60 

60 

59 

58 

56 

54 

53 

52 

52 

62 

63 

62 

61 

61 

60 

58 

57 

56 

55 

54 

53 

63 

64 

63 

62 

62 

61 

60 

59 

58 

57 

56 

56 

55 

54 

64 

65 

64 

63 

63 

62 

61 

60 

59 

59 

58 

57 

56 

55 

65 

66 

65 

64 

64 

63 

62 

61 

60 

60 

59 

58 

57 

56 

66 

67 
68 

67 
68 

66 
67 

65 
66 

64 
65 

63 
64 

62 
63 

61 
62 

61 
62 

60 
61 

i 

58 
59 

57 
58 

68 

69 

69 

68 

67 

66 

65 

64 

63 

63 

62 

61 

60 

59 

69 

70 

70 

69 

68 

67 

67 

66 

65 

64 

63 

62 

61 

61 

70 

71 

70 

69 

68 

68 

67 

66 

65 

64 

63 

62 

62 

71 

72 
73 

72 
73 

72 

70 

69 
70 

69 
70 

68 
69 

6? 

66 
67 

66 

1 

64 

72 
73 

74 

74 

73 

72 

71 

70 

69 

68 

67 

67 

66 

65 

74 

75 

75 

74 

73 

72 

72 

7i 

70 

69 

68 

68 

67 

66 

75 

76 

76 

75 

74 

73 

73 

72 

71 

.  70 

69 

69 

68 

67 

76 

77 
78 
79 

11 

79 

76 

75 
76 
77 

74 

11 

74 

g 

73 
74 

75 

72 
73 

74 

72 
73 

70 
72 

70 
72 

69 
70 
71 

68 
69 
70 

77 
78 
79 

So 

80 

79 

78 

77 

77 

76 

75 

74 

73 

73 

72 

72 

80 

• 

o°.5 

10.0 

•°.5 

2°.0 

2°.  5 

3°-o 

3°-5 

4°.o 

4°-  5 

5°-o 

5°-5 

6°.o 

t 

Temperature  of  the  dew  point,  in  degrees  Fahrenheit. 


a> 

Difference  between  the  dry  and  wet  thermometers  (t  —  t'  ). 

iC 

& 

-K>  "*-* 

g 

6°.o 

6°-  5 

70.0 

7°-  5 

80.0 

8°.  5 

9°.o 

9°-5 

10°.  0 

100.5 

11°.  0 

u0.5 

12°.  0 

Q 

19 

-32 

—59 

19 

20 

—19 

—26 

—41 

20 

21 

—15 

—21 

—32 

21 

22 

—  12 

—  T8 

—25 

—41 

22 

23 

—  9 

-15 

—  20 

—  31 

—59 

23 

24 

—  6 

—  12 

—  16 

—25 

—40 

24 

25 

—  3 

—  8 

—14 

—  22 

—30 

—55 

25 

26 
27 

—  i 

—  5 
—  3 

—  10 

-  7 

—17 
—13 

-11 

—37 
—29 

—50 

26 

28 

3 

0 

—  4 

—  10 

—  16 

—  22 

—35 

28 

29 

5 

+  2 

-  7 

—  12 

—  18 

—27 

—45 

29 

30 

7 

4 

+  i 

_  3 

—  8 

—  14 

—20 

—32 

30 

31 

9 

6 

3 

+  i 

—  5 

—  10 

—  16 

—24 

—39 

31 

32 

ii 

8 

5 

2 

—  2 

-  7 

—12 

—  18 

—28 

—52 

32 

33 

13 

10 

7 

4 

0 

—  4 

—  8 

—14 

—  21 

—34 

33 

34 

14 

ii 

9 

6 

+  3 

—  i 

5 

—  10 

—  18 

—25 

—42 

34 

35 

16 

13 

ii 

8 

5 

+  2 

—  2 

-  7 

-15 

—20 

—29 

—55 

35 

36 

18 

15 

13 

10 

8 

4 

+  I 

—  3 

—  8 

—15 

—  21 

—35 

36 

37 

19 

17 

15 

12 

10 

7 

4 

0 

—  5 

—10 

—17 

—25 

—43 

37 

38 

21 

19 

14 

12 

9 

6 

+  3 

—  i 

—  6 

—  12 

—29 

38 

39 

22 

20 

18 

16 

14 

ii 

8 

5 

+  2 

3 

—  8 

—14 

—20 

39 

40 

24 

22 

20 

18 

16 

13 

ii 

7 

4 

o 

—  4 

—10 

—  16 

40 

41 

25 

23 

22 

19 

17 

15 

13 

10 

7 

+  3 

0 

—  5 

—  ii 

41 

42 

26 

24 

23 

21 

19 

17 

15 

12 

9 

6 

+  3 

—  i 

—  6 

42 

43 

28 

26 

25 

23 

31 

19 

17 

14 

12 

9 

6 

-f-  2 

—  2 

43 

44 

29 

27 

26 

24 

23 

21 

19 

16 

14 

ii 

8 

5 

+  I 

44 

45 

30 

28 

27 

26 

24 

22 

20 

18 

16 

13 

ii 

7 

4 

45 

46 

32 

30 

29 

27 

26 

24 

22 

20 

18 

15 

13 

10 

7 

46 

47 

33 

31 

3° 

29 

27 

25 

24 

22 

20 

'  17 

15 

12 

10 

47 

48 

33 

32 

30 

29 

27 

25 

23 

22 

19 

17 

14 

12 

48 

49 

36 

34 

33 

31 

30 

28 

27 

25 

23 

21 

19 

17 

14 

49 

50 

37 

35 

34 

33 

31 

30 

28 

27 

25 

23 

21 

19 

17 

50 

51 

38 

37 

36 

34 

33 

31 

30 

28 

27 

25 

23 

21 

19 

52 

40 

38 

37 

36 

34 

33 

31 

30 

28 

27 

25 

23 

21 

52 

53 

41 

39 

38 

37 

36 

34 

33 

31 

30 

28 

27 

25 

23 

53 

54 

42 

40 

39 

37 

36 

34 

33 

31 

30 

28 

27 

25 

54 

55 

43 

42 

41 

40 

39 

37 

36 

34 

33 

31 

30 

28 

27 

55 

56 

44 

43 

42 

41 

40 

39 

37 

36 

34 

33 

31 

30 

28 

56 

57 
58 

46 
47 

45 
46 

44 
45 

42 
44 

42 

40 
41 

39 
40 

37 
39 

36 
37 

33 

31 

33 

30 
31 

57 

58 

59 

48 

47 

46 

45 

44 

43 

4i 

40 

39 

38 

36 

35 

33 

59 

60 

49 

48 

47 

46 

45 

44 

43 

41 

40 

39 

38 

36 

35 

60 

61 

50 

49 

48 

47 

46 

45 

44 

43 

42 

39 

38 

36 

61 

62 

52 

51 

50 

49 

48 

47 

45 

44 

43 

42 

39 

38 

62 

63 

53 

52 

51 

50 

49 

48 

47 

45 

44 

43 

42 

39 

63- 

64 

54 

53 

52 

50 

49 

48 

47 

46 

45 

43 

42 

41 

64 

65 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

43 

42 

65 

66 

56 

55 

54 

53 

52 

51 

So 

49 

48 

47 

46 

45 

44 

66 

67 

57 

56 

55 

55 

54 

53 

52 

50 

48 

47 

46 

45 

67 

68 

58 

57 

57 

56 

54 

53 

52 

50 

49 

47 

46 

68 

69 

59 

58 

58 

57 

56 

55 

54 

53 

52 

50 

49 

48 

69 

70 

61 

60 

59 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

70 

71 

62 

61 

60 

59 

58 

57 

56 

55- 

55 

54 

53 

52 

7* 

72 
73 

63 
64 

62 
63 

61 
62 

60 
62 

59 
61 

59 
60 

58 
59 

57. 
58 

56 
57 

55, 
56 

54 

53 

54 

52 
53 

72 
73 

74 

65 

64 

63 

63 

62 

61 

60 

59 

58 

57 

56 

55 

54 

74 

75 

66 

65 

64 

64 

63 

62 

61 

60 

59 

58 

57 

56 

56 

75 

76 

67 

66 

65 

65 

64 

63 

62 

61 

61 

60 

59 

58 

57 

76 

77 

68 

67 

67 

66 

65 

64 

63 

62 

62 

61 

60 

59 

58 

77 

78 

69 

68 

68 

67 

66 

66 

65 

94 

63 

62 

61 

60 

59 

78 

79 

70 

69 

69 

68 

67 

67 

66 

65 

64 

63 

62 

61 

61 

79 

80 

72 

7i 

70 

69 

68 

68 

67 

66 

65 

64 

63 

62 

62 

80 

t 

6°.o 

6°-5 

7o.o 

7°-5 

8°.o 

80.5 

9°-o 

9°-  5 

10°.  O 

o°.5 

,0.0 

'  jO,  c 

120.0 

t 

Temperature  of  the  dew  point,  in  degrees  Fahrenheit. 


7 

o 

,G 

Difference  between  the  dry  and  wet  thermometers  (t—  t' 

Q 

12°.  0 

12°,  5 

130.0 

i3°-  5 

14°.  o  14°.  5 

15°.  o 

i5°-5 

i6°.o 

16°.  5 

17°.  o 

i7°-5 

i8°.o 

| 

40 

—  16 

—23 

—40 

40 

41 

—  ii 

—  16 

—27 

—50 

4i 

42 

—  6 

—  13 

—  22 

42 

43 

—  2 

—  8 

—  15 

—  21 

-36 

43 

44 

+  I 

—  4 

—  9 

—  17 

—24 

—42 

44 

45 

4 

0 

—  5 

—  II 

—19 

—27 

—53 

45 

46 

7 

+  3 

—  I 

—  6 

—  12   —  18 

46 

47 

10 

6 

4-  3 

—  i 

—  7  —  H 

—  20 

—35 

47 

48 

12 

9 

6 

+  2 

-  2   -  8 

—  16 

—23 

—40 

48 

49 

14 

ii 

9 

5 

+  i   —  3 

—  10 

—  18 

—25 

-46 

49 

50 

17 

14 

ii 

8 

5     o 

—  5 

—ii 

—  20 

—28 

-58 

50 

19 

16 

14 

ii 

8+4 

0 

—  6 

—  12 

—  18 

52 

21 

18 

16 

13 

ii  j   7 

4-  3 

—  i 

—  6 

—13 

—19 

—34 

52 

53 

23 

20. 

18 

16 

13    10 

7 

+  2 

—  2 

—  5 

—15 

—21 

-38 

53 

54 

25 

23 

20 

18 

16    13 

10 

6 

H-  2 

—  8 

—  16 

—23 

54 

55 

27 

25 

23 

20 

18    15 

12 

9 

6 

+  2 

3 

—  9 

—17 

55 

56 

28 

26 

25 

22 

20  '    18 

15 

12 

9 

5 

+  1 

—  4 

—  10 

56 

57 

3° 

28 

26 

24 

22  1    20 

18 

15 

12 

9 

5 

o 

—  4 

57 

58 

3i 

3° 

28 

26 

24     22 

20 

18 

15 

12 

9 

+  4 

0 

58 

59 

33 

32 

30 

28 

26 

24 

22 

20 

18 

15 

12 

8 

-f  4 

59 

60 

35 

33 

32 

3° 

28 

26 

24 

22 

20 

18 

15 

12 

8 

60 

61 

36 

35 

33 

32 

30 

28 

26 

24 

22 

20 

18 

15 

12 

61 

62 

38 

35 

34 

32 

30 

28 

26 

24 

22 

20 

18 

15 

62 

63 

39 

38 

37 

35 

34 

32 

30 

28 

26 

24 

22 

20 

18 

63 

64 

39 

38 

37 

35 

34 

32 

30 

28 

27 

24 

22 

20 

64 

65 

42 

41 

40 

38 

37 

35 

34 

32 

30 

28 

27 

25 

23 

65 

66 

44 

43 

41 

40 

38 

37 

35 

34 

32 

30 

29 

27 

25 

66 

67 

45 

44 

43 

41 

40 

39 

37 

36 

34 

32 

31 

29 

27 

67 

68 

46 

45 

44 

43 

42 

40 

39 

38 

36 

34 

33 

31 

29 

68 

69 

48 

47 

46 

45 

43 

.  42 

40 

39 

38 

36 

34 

33 

31 

69 

70 

49 

48 
49 

47 
48 

46 
47 

$ 

43 

42 
43 

42 

39 

38 

39 

36 
38 

g 

33 

35 

70 

72 

52 

51 

50 

•  49 

47 

46- 

45 

44 

43 

40 

38 

37 

72 

73 

53 

52 

5« 

49 

48 

46 

45 

44 

43 

41 

40 

38 

73 

74 

54 

53 

52 

50 

49 

48 

47 

45 

44 

43 

41 

40 

74 

75 

56 

55 

54 

53 

52 

50 

49 

48 

47 

45 

44 

43 

42 

75 

76 

I 

56 

57 

55 
56 

54 

53 

54 

52 
53 

50 
52 

49 

48 
50 

47 
49 

46 
48 

J3 

43 
45 

77 

79 

i? 

60 

57 
59 

58 

55 
57 

53 

55 

52 
54 

53 

5° 
52 

49 

48 
49 

9 

78 
79 

80 

62 

61 

60 

59 

58 

57 

56 

55 

54 

53 

52 

51 

50 

80 

t 

12°.  0 

12°.  5 

130.0 

13  *  5 

14°.  o 

i4°-5 

15°.  o 

I5°.5 

i6°.o 

i6°.5 

17°.  o 

I7°-  5 

i8°.o 

t 

Temperature  of  the  dew  point,  in  degrees  Fahrenheit. 


OJ 

5 

•si  "*"* 

Difference  between  the  dry  and  wet  thermometers  (t  —  <'). 

A 

Q 

i8°.o 

19°.  o 

20°.  0 

2I°.0 

22°.  0 

23°.  o 

24°.  o 

25°.  o 

26°.  o 

270.0 

28°.  o 

29°.  o  30°.  o 

| 

55 

-17 

—47 

55 

56 

—  10 

—27 

1 

56 

57 

—  4 

—  16 

57 

58 

o 

—  9 

—30 

58 

59 

4-4 

—  3 

-18 

59 

60 

8 

o 

—13 

—34 

60 

61 

12 

+  4 

-  6 

—  20 

61 

62 

15 

8 

0 

—  II 

—39 

62 

63 

18 

12 

4-4 

—  6 

—  21 

63 

64 

20 

15 

8 

o 

—  12 

--44 

64 

65 

23 

18 

12 

4-4 

—  5 

—23 

65 

66 

25 

20 

15 

8 

—  12 

-49 

66 

67 

27 

23 

18 

12 

4-4 

—  6 

—24 

67 

68 

29 

25 

20 

15 

8 

—  i 

—13 

-52 

68 

69 

31 

27 

23 

18 

12 

4-4 

—  5 

—24 

69 

70 

33 

29 

25 

21 

15 

9 

0 

—13 

—55 

70 

72 
73 

35 

i 

33 

35 

28 
3° 
32 

2 

28 

18 

21 
24 

12 

16 
19 

4-5 

9 
13 

—  5 
o 

4-5 

—24 

—  12 

—  4 

—55 
—24 

72 

73 

74 

40 

37 

34 

30 

26 

22 

16 

9 

0 

—12 

—53 

74 

75 

42 

39 

36 

32 

29 

24 

19 

13 

4-5 

—  4 

—23 

75 

76 

43 

38 

34 

31 

27 

22 

17 

10 

—  i 

—  ii 

—49 

76 

77 

45 

42 

40 

% 

33 

29 

25 

20 

14 

4-6 

—  5 

—22 

77 

78 

47 

44 

41 

38 

35 

31 

28 

23 

17 

ii 

4*  2 

—  IO 

—44 

78 

79 

48 

46 

43 

40 

37 

34 

30 

26 

21 

15 

7 

-  4 

—  20 

79 

80 

50 

47 

45 

42 

39 

36 

32 

28 

24 

18 

12 

4-3 

—  8 

80 

t 

i8°.o 

19°.  o 

20°.  0 

21°.  0 

22°.  0 

23°.  o 

24°.  o 

25°.  o 

26°.  0 

27°.  o 

28°.  0 

29°.  o 

30°.  o 

t 

Temperature  of  the  dew  point,  in  degrees  Fahrenheit. 


1 

Difference  between  the  dry  and  wet  thermometers  (  t—  t'  ). 

1 

a 

10.0 

2°.0 

3°-o 

4°.o 

50.0 

6°.  o  7°.o 

8°.o 

9°.o 

10°.  0 

II°.0 

12°.  O 

| 

So 

79 

77 

76 

74 

73 

72    70 

68 

67 

65 

63 

62 

80 

Si 

80 

78 

77 

75 

74 

73    7i 

70 

68 

66 

65 

63 

81 

82 

Si 

79 

78 

77 

75 

74  •   72 

69 

68 

66 

64 

82 

83 

82 

So 

79 

78 

76 

75    73 

72 

70 

69 

67 

65 

83 

84 

83 

Si 

So 

79 

77 

76    74 

73 

70 

68 

67 

84 

85 

84 

82 

81 

80 

78 

77    75 

74 

72 

7i 

69 

68 

85 

86 

85 

83 

82 

81 

79 

78  i   76 

75 

73 

72 

71 

69 

86 

87 

86 

84 

83 

82 

So 

79  !   78 

76 

74 

73 

72 

70 

87 

88 

87 

85 

84 

83 

81 

So    79 

77 

75 

74 

73 

88 

89 

88 

86 

85 

84 

82 

81 

So 

78 

76 

76 

74 

72 

89 

90 

89 

87 

86 

85 

84 

82 

81 

79 

78 

77 

75 

74 

90 

92 

90 

88 
89 

87 
88 

86 
87 

85 
86 

8 

82 
83 

80 

82 

g 

78 
79 

76 
77 

75 

76 

92 

93 

92 

91 

89 

88 

87 

85 

84 

83 

81 

So 

78 

77 

93 

94 

93 

92 

90 

89 

88 

86 

85 

84 

82 

81 

80 

78 

94 

95 

94 

93 

9i 

90 

89 

87 

86 

85 

83 

82 

81 

79 

95 

96 

94 

92 

90 

88 

87 

86 

84 

83 

82 

80 

96 

96 

95 

93 

92 

90 

88 

87 

86 

84 

83 

81 

97 

98 

97 

96 

94 

93 

92 

89 

88 

87 

85 

84 

83 

98 

99 

98 

97 

95 

94 

93 

92 

90 

89 

88 

86 

85 

84 

99 

IOO 

99 

98 

96 

95 

94 

93 

91 

90 

89 

87 

86 

85 

IOO 

IOI 

IOO 

99 

97 

96 

95 

94 

92 

90 

88 

87 

86 

IOI 

102 

IOI 

IOO 

98 

97 

96 

95 

93 

92 

90 

88 

87 

102 

103 

102 

IOI 

99 

98 

97 

96 

94 

93 

92 

89 

88 

103 

104 

103 

102 

IOO 

99 

98 

97 

96 

94 

93 

92 

90 

89 

104 

105 

104 

I03 

IOI 

IOO 

99 

98 

97 

95 

94 

93 

9i 

90 

105 

1  06 

105 

104 

1  02 

IOI 

IOO 

99 

98 

96 

95 

94 

93 

106 

107 

106 

105 

103 

102 

IOI 

IOO 

99 

97 

96 

95 

94 

92 

107 

108 

107 

1  06 

104 

I03 

102 

IOI 

IOO 

98 

96 

93 

108 

109 

1  08 

107 

105 

104 

103 

102 

IOI 

99 

98 

97 

96 

94 

109 

IIO 

109 

108 

107 

105 

104 

103 

102 

IOI 

99 

98 

97 

96 

IIO 

in 

IIO 

109 

108 

106 

105 

104 

103 

102 

IOO 

99 

98 

97 

III 

112 

in 

IIO 

109 

107 

106 

105 

104 

103 

IOI 

IOO 

99 

98 

112 

"3 

112 

III 

no 

108 

107 

106 

105 

104 

102 

ioi 

IOO 

99 

"3 

114 

"3 

112 

in 

109 

108 

107 

106 

105 

103 

IO2 

IOI 

IOO 

114 

115 

114 

"3 

112 

IIO 

109 

108 

107 

106 

I«5 

103 

102 

IOI 

115 

116 

"5 

114 

"3 

III 

IIO 

109 

108 

107 

106 

104 

103 

102 

116 

117 

116 

"5 

114 

112 

in 

IIO 

109 

108 

107 

105 

104 

103 

117 

118 

117 

116 

"5 

"3 

112 

III 

no 

109 

1  08 

106 

105 

104 

118 

119 

118 

117 

116 

114 

"3 

112 

in 

no 

109 

107 

106 

105 

119 

120 

119 

118 

117 

"5 

114 

"3 

112 

in 

IIO 

108 

107 

106 

120 

121 

120 

119 

118 

117 

"5 

114 

"3 

112 

til 

IIO 

108 

107 

121 

122 

121 

120 

119 

118 

116 

115 

114 

"3 

112 

in 

109 

108 

122 

123 

122 

121 

120 

119 

117 

116 

lie 

114 

"3 

112 

IIO 

109 

123 

124 

123 

122 

121 

120 

118 

117 

116 

114 

"3 

III 

IIO 

124 

125 

124 

I23 

122 

121 

119 

118 

117 

116 

"5 

114 

112 

III 

125 

126 

125 

124 

I23 

122 

1  20 

119 

118 

117 

1x6 

"5 

114 

112 

126 

127 

126 

125 

124 

I23 

121 

120 

119 

1.8 

117 

116 

"5 

"3 

127 

128 

127 

126 

"5 

124 

122 

121 

120 

119 

118 

117 

116 

114 

128 

I29 

128 

127 

126 

125 

123 

122 

121 

1  20 

119 

118 

117 

115 

I29 

130 

I29 

128 

127 

126 

124 

123 

122 

121 

120 

119 

118 

117 

130 

I30 

I29 

128 

127 

125 

124 

I23 

122 

121 

120 

119 

118 

132 

130 

I29 

T28 

126 

125 

124 

123 

122 

121 

120 

119 

I32 

133 

I32 

130 

129 

128 

126 

"5 

124 

123 

122 

121 

120 

133 

134 

133 

I32 

130 

I29 

127 

126 

125 

124 

123 

122 

121 

134 

135 

134 

133 

132 

I3I 

130 

128 

127 

126 

125 

124 

123 

122 

135 

136 

135 

134 

133 

132 

I29 

128 

127 

126 

125 

124 

123 

136 

137 

136 

135 

134 

133 

132 

130 

129 

128 

'27 

126 

125 

124 

^37 

138 

137 

136 

135 

134 

133 

130 

129 

128 

127 

126 

"5 

138 

139 

138 

137 

I36 

135 

134 

132 

130 

129 

128 

127 

126 

139 

140 

139 

138 

137 

I36 

135 

133 

132 

131 

130 

I29 

128 

127 

140 

t 

,0.0 

2°-0 

3°-o 

4°-o 

50.0 

6°.o 

7°.o 

8°.o 

9°.o 

10°.  0 

,,0.0 

12°.  0 

; 

10 


Temperature  of  the  dew  point,  in  degrees  Fahrenheit. 


5 

7 

Difference  between  the  dry  and  wet  thermometers  (  t—  f  ). 

xj 

""  >, 

1 

| 

""  >, 

p 

12°.  O 

I30.o 

14°.  o 

I5<>.0 

i6°.o 

17°.  o 

i8°.o 

19°.  O  20°.  0 

2I°.0 

22°.  O 

23°.  o 

240.0 

5 

80 

62 

60 

58 

56 

54 

52 

50 

47 

45 

42 

39 

36 

32 

so 

81 

63 

61 

59 

57 

55 

53 

51 

49 

47 

44 

41 

38 

35 

81 

82 

64 

62 

61 

59 

57 

53 

50 

48 

45 

43 

40 

37 

82 

83 

65 

64 

62 

60 

58 

56 

54 

52 

50 

47 

44 

42 

39 

83 

84 

67 

65 

63 

61 

59 

57 

55 

53 

49 

46 

43 

84 

85 

68 

66 

64 

62 

61 

59 

57 

55 

53 

50 

48 

45 

42 

85 

86 

69 

67 

66 

64 

62 

60 

58 

56 

54 

52 

49 

47 

44 

86 

87 

70 

68 

67 

65 

63 

61 

59 

57 

55 

53 

48 

46 

87 

88 

7° 

68 

66 

64 

63 

6r 

59 

53 

50 

48 

88 

89 

72 

69 

67 

66 

64 

62 

60 

58 

56 

54 

52 

'  49 

89 

90 

74 

72 

70 

69 

67 

65 

63 

62 

60 

58 

56 

53 

51 

90 

92 

75 
76 

73 

74 

72 

73 

70 

69 

67 
68 

65 
66 

63 

64 

61 
62 

59 
60 

ii 

53 
54 

92 

93 

77 

75 

74 

72 

69 

67 

66 

64 

62 

60 

58 

56 

93 

94 

78 

77 

75 

73 

72 

70 

69 

67 

65 

63 

61 

59 

57 

94 

95 

79 

78 

76 

'  75 

73 

7i 

70 

68 

66 

64 

63 

61 

59 

95 

96 

80 

79 

77 

76 

74 

73 

69 

68 

66 

64 

62 

60 

96 

97 

81 

80 

78 

77 

75 

74 

72 

69 

67 

65 

63 

61 

97 

98 
99 

83 

84 

81 

82 

80 
81 

78 
79 

3 

\l 

73 
75 

72 

73 

70 

68 
70 

67 

68 

65 
66 

63 

64 

98 
99 

IOO 

85 

83 

82 

80 

79 

77 

76 

74 

73 

71 

69 

67 

66 

IOO 

IOI 

86 

84 

83 

82 

80 

79 

77 

75 

74 

72 

69 

67 

IOI 

102 

87 

85 

84 

83 

81 

80 

78 

77 

75 

73 

72 

70 

68 

102 

103 
104 

88 
89 

§ 

85 

82 
83 

81 
82 

79 
81 

78 
79 

.  76 

78 

11 

73 
74 

71 
73 

70 

103 
104 

105 

90 

89 

87 

86 

85 

83 

82 

80 

79 

77 

76 

74 

72 

105 

106 

90 

89 

87 

86 

84 

83 

81 

80 

74 

106 

107 
108 

92 
93 

92 

90 

89 

87 

88 

85 

84 

85 

83 
84 

81 
82 

8? 

78 

9 

107 

108 

109 

94 

93 

92 

90 

89 

88 

86 

85 

83 

82 

80 

79 

77 

109 

IIO 

96 

94 

93 

92 

90 

89 

87 

86 

85 

83 

82 

80 

79 

no 

III 

97 

94 

93 

90 

89 

87 

86 

84 

83 

81 

80 

in 

112 

98 

96 

94 

92 

90 

88 

87 

85 

83 

81 

112 

"3 

99 

97 

96 

95 

93 

92 

91 

89 

88 

87 

85 

84 

82 

"3 

114 

IOO 

99 

97 

96 

95 

93 

92 

89 

88 

86 

85 

83 

114 

115 

IOI 

IOO 

98 

97 

96 

94 

93 

92 

90 

89 

88 

86 

85 

"5 

116 

102 

IOI 

99 

98 

97 

95 

94 

93 

91 

90 

89 

87 

86 

116 

117 

103 

102 

IOO 

99 

98 

96 

94 

93 

91 

90 

88 

87 

117 

118 

104 

103 

IOI 

IOO 

99 

97 

96 

95 

94 

92 

90 

88 

118 

119 

105 

104 

103 

IOI 

IOO 

99 

97 

96 

95 

93 

92 

91 

89 

119 

120 

106 

105 

104 

1  02 

IOI 

IOO 

99 

97 

96 

95 

93 

92 

90 

120 

121 

107 

106 

105 

103 

102 

IOI 

IOO 

98 

97 

96 

94 

93 

92 

121 

122 

108 

107 

106 

105 

103 

102 

IOI 

99 

98 

97 

96 

94 

93 

122 

123 

109 

108 

107 

106 

104 

103 

102 

IOI 

99 

98 

95  I   94 

123 

124 

IIO 

109 

108 

107 

105 

104 

103 

1  02 

IOO 

99 

98 

96 

95 

124 

"5 

III 

IIO 

109 

1  08 

106 

105 

104 

103 

IOI 

IOO 

99 

98 

96 

"5 

126 

112 

III 

IIO 

109 

108 

106 

105 

104 

103 

IOI 

IOO 

99 

97 

126 

127 

113 

112 

in 

no 

109 

107 

106 

105 

104 

102 

IOI 

IOO 

98 

127 

128 

114 

"3 

112 

in 

IIO 

108 

107 

106 

105 

103 

IO2 

IOI 

IOO 

128 

129 

114 

"3 

112 

III 

IIO 

108 

107 

106 

105 

103 

1  02 

IOI 

I29 

130 

117 

1I5 

114 

"3 

112 

in 

109 

108 

107 

106 

104 

103 

1  02 

130 

118 

116 

115 

114 

"3 

112 

IIO 

109 

108 

107 

106 

104 

103 

132 
133 

119 
1  20 

117 
118 

116 
117 

IS 

114 
H5 

"3 

114 

112 

"3 

IIO 

in 

109 

IIO 

108 

109 

107 
108 

105 

106 

104 
105 

132 
133 

134 

121 

120 

1  18 

117 

116 

115 

114 

112 

III 

IIO 

109 

108 

106 

134 

135 

122 

121 

119 

118 

117 

116 

"5 

"3 

112 

in 

IIO 

109 

107 

135 

I36 

I23 

122 

1  20 

119 

118 

117 

116 

"5 

"3 

112 

III 

IIO 

108 

136 

137 

124 

123 

121 

1  20 

119 

118 

117 

116 

114 

"3 

112 

in 

no 

137 

138 

125 

124 

122 

121 

120 

119 

118 

117 

"5 

114 

"3 

112 

in 

138 

139 

126 

125 

124 

122 

121 

1  20 

119 

118 

117 

"5 

114 

"3 

112 

139 

I4O 

127 

126 

"5 

123 

122 

121 

120 

119 

118 

116 

115 

114 

113 

140 

t 

12°.  0 

13°.  o 

14°.  o 

15°.  o 

i6°.o 

17°.  o 

i8°.o 

19°.  o 

20°.  0 

21°.  O 

22°.  0 

230.0 

240.0 

t 

11 


Temperature  of  the  dew  point,  in  degrees  Fahrenheit. 


fi 

CO 

•w  "** 

Difference  between  the  dry  and  wet  thermometers  (  I  —  f  ). 

~~ 

1 

24°.  o 

25°.  o 

26°.  o 

270.0 

28°.0 

29°.  o 

30°.  o 

31°.  o 

32°.  o 

33°-o 

340.0 

35°-o 

36°.  o 

Q 

80 

32 

28 

24 

18 

12 

3 

—  II 

—40 

80 

81 

35 

31 

26 

22 

16 

8 

—  2 

—  18 

1 

81 

82 

37 

33 

29 

25 

19 

13 

+  4 

—  7 

—35 

82 

83 

39 

35 

27 

22 

i? 

9 

—  i 

—15 

83 

84 

37 

34 

30 

25 

20 

14 

+  5 

—  5 

—30 

84 

85 

42 

39 

36 

32 

28 

23 

18 

ii 

+  i 

—13 

85 

86 

44 

38 

35 

30 

26 

21 

15 

7 

-  5 

—25 

86 

87 

46 

43 

40 

37 

33 

29 

24 

19 

12 

+  3 

—  ii 

87 

88 

48 

45 

42 

39 

31 

27 

22 

16 

8 

—  2 

—21 

88 

89 

49 

47 

44 

38 

34 

30 

25 

20 

13 

+  4 

—  IO 

—44 

89 

90 

5i 

48 

46 

43 

40 

36 

32 

28 

23 

18 

10 

—  I 

—20 

90 

53 

50 

47 

45 

42 

38 

35 

31 

26 

21 

15 

+  6 

—  7 

91 

92 

54 

52 

49 

46 

44 

37 

34 

29 

25 

19 

12 

+  I 

92 

93 

56 

53 

51 

48 

46 

43 

39 

36 

32 

28 

23 

16 

8 

93 

94 

57 

55 

53 

50 

47 

45 

42 

38 

35 

31 

26 

20 

13 

94 

95 

59 

56 

54 

52 

49 

46 

44 

40 

37 

33 

29 

24 

18 

95 

96 

60 

58 

56 

53 

51 

48 

46 

43 

39 

36 

32 

27 

22 

96 

97 

61 

59 

57 

55 

53 

50 

47 

45 

41 

38 

34 

30 

25 

97 

98 

63 

61 

59 

57 

52 

49 

47 

44 

40 

37 

33 

28 

98 

99 

64 

62 

60 

58 

56 

54 

48 

46 

43 

39 

35 

31 

99 

IOO 

66 

64 

62 

60 

57 

55 

53 

50 

48 

45 

4i 

38 

34 

IOO 

101 

67 

65 

63 

61 

59 

57 

54 

52 

49 

47 

44 

40 

37 

IOI 

102 

68 

66 

63 

61 

58 

56 

54 

49 

46 

43 

39 

102 

103 

70 

68 

66 

64 

62 

60 

58 

55 

53 

50 

48 

45 

I03 

104 

71 

69 

67 

65 

63 

61 

59 

57 

55 

52 

5° 

47 

44 

104 

105 

72 

70 

69 

67 

65 

63 

61 

59 

56 

54 

52 

49 

46 

105 

106 

74 

72 

70 

68 

66 

64 

62 

60 

56 

53 

51 

48 

106 

107 

75 

73 

71 

70 

68 

66 

64 

62 

60 

57 

55 

52 

50 

107 

106 

76 

74 

73 

71 

69 

67 

65 

63 

61 

59 

57 

54 

52 

108 

109 

77 

76 

74 

72 

69 

67 

65 

63 

61 

58 

56 

54 

109 

IIO 

79 

77 

75 

74 

72 

70 

68 

66 

64 

62 

60 

58 

55 

no 

III 

80 

78 

77 

73 

70 

68 

66 

64 

62 

59 

57 

in 

112 

81 

79 

78 

76 

74 

73 

69 

67 

65 

63 

61 

59 

112 

"3 

82 

81 

79 

77 

76 

74 

72 

69 

67 

65 

63 

60 

"3 

114 

83 

82 

80 

79 

77 

75 

74 

72 

70 

68 

66 

64 

62 

114 

115 

116 
117 

85 
86 

87 

U 

85 

82 

80 
81 
82 

78 
80 
81 

77 
78 
79 

78 

73 

11 

72 
73 
74 

70 
72 

68 
69 

66 
4 

64 

§ 

"5 
116 
117 

118 

88 

87 

85 

84 

82 

81 

79 

77 

76 

74 

72 

70 

68 

118 

119 

89 

88 

86 

85 

83 

82 

80 

79 

77 

75 

74 

72 

70 

119 

120 

90 

89 

88 

86 

85 

83 

82 

80 

78 

77 

75 

73 

71 

120 

121 

92 

90 

89 

87 

86 

84 

83 

81 

80 

78 

76 

74 

73 

121 

122 

93 

91 

90 

89 

87 

86 

84 

83 

81 

79 

78 

76 

74 

122 

J23 

94 

93 

90 

88 

87 

85 

84 

82 

81 

79 

77 

'75 

I23 

124 

95 

94 

92 

89 

88 

87 

85 

83 

82 

•  80 

79 

77 

124 

"5 

96 

95 

93 

92 

9i 

89 

88 

86 

85 

83 

82 

80 

78 

125 

126 

96 

93 

92 

90 

89 

87 

86 

84 

83 

81 

80 

126 

I2V 

98 

97 

96 

94 

93 

92 

90 

89 

87 

86 

84 

83 

81 

127 

128 

IOO 

98 

97 

96 

94 

93 

90 

88 

87 

85 

84 

82 

128 

129 

IOI 

99 

98 

97 

95 

94 

93 

90 

88 

87 

85 

84 

I29 

I30 

1  02 

IOI 

99 

98 

97 

95 

94 

92 

91 

89 

88 

86 

85 

130 

103 

102 

IOO 

99 

98 

96 

95 

94 

92 

89 

88 

86 

131 

I32 

104 

I03 

IOI 

IOO 

99 

97 

96 

95 

93 

92 

90 

89 

87 

I32 

133 

105 

104 

103 

IOI 

IOO 

99 

97 

96 

94 

93 

92 

90 

89 

133 

134 

106 

105 

104 

102 

IOI 

IOO 

98 

97 

96 

94 

93 

9i 

90 

134 

135 

107 

106 

105 

104 

102 

IOI 

IOO 

98 

97 

95 

94 

93 

9i 

135 

136 

108 

107 

106 

105 

103 

102 

IOI 

99 

98 

97 

95 

94 

92 

136 

IIO 

108 

107 

106 

104 

103 

IO2 

IOI 

99 

98 

96 

95 

94 

137 

138 

III 

109 

108 

107 

106 

104 

I03 

IO2 

IOO 

99 

98 

96 

95 

138 

139 

112 

IIO 

109 

108 

107 

105 

104 

103 

IOI 

IOO 

99 

97 

96 

139 

140 

H3 

112 

IIO 

109 

108 

107 

105 

104 

103 

IOI 

IOO 

99 

97 

140 

t 

24°.0 

25°.  o 

260.0 

270.0 

28°.0 

29°.  o 

30°.  o 

31°.  o 

32°.  o 

33°-o 

34o.o 

35°.  o  [360.0 

t 

1 

12 


Temperature  of  the  dew  point,  in  degrees  Fahrenheit. 


t-l 
o> 
£1 

Difference  between  the  dry  and  wet  thermometers  (  t  —  t'  ). 

O» 

Q 

36^.0 

370.0 

38°.  o 

390.0 

40°.  o 

41°.  o 

42°.  o 

43o.o 

440.0 

45°-o 

46°.  o 

470.0 

48°.  o 

c 

Q 

89 

—44 

89 

90 

—17 

90 

91 

—  7 

—33 

91 

92 

+  i 

-13 

92 

93 

8 

—  4 

—26 

93 

94 

13 

+  4 

—  IO 

94 

95 

18 

10 

—  I 

—  20 

95 

96 

22 

15 

4-  6 

—  6 

—40 

96 

97 

25 

19 

12 

4-  i 

—15 

97 

98 

28 

23 

17 

8 

—  4 

-29 

98 

99 

31 

27 

21 

14 

4-4 

—  II 

99 

IOO 

34 

30 

25 

19 

II 

o 

—  21 

IOO 

101 

37 

32 

28 

23 

16 

4-7 

—  6 

—42 

101 

102 

39 

35 

31 

26 

20 

13 

+  3 

-14 

1  02 

103 

41 

38 

34 

29 

24 

18 

10 

—  2 

—28 

103 

104 

44 

40 

37 

32 

28 

22 

15 

4-6 

—  9 

104 

105 

46 

43 

39 

35 

31 

26 

20 

12 

+  i 

—19 

105 

106 

48 

45 

42 

38 

34 

29 

24 

17 

9 

—  4 

-38 

106 

107 

50 

47 

44 

40 

37 

32 

28 

22 

15 

4-4 

—  12 

107 

108 

52 

49 

46 

43 

39 

31 

26 

19 

ii 

0 

—24 

108 

109 

54 

48 

45 

42 

38 

34 

30 

24 

17 

+  8 

—  6 

-56 

109 

no 

55 

53 

50 

47 

44 

41 

37 

33 

28 

21 

H 

+  4 

—15 

no 

in 

57 

54 

52 

49 

46 

43 

39 

31 

25 

19 

ii 

—  i 

in 

112 

59 

56 

48 

45 

42 

38 

34 

29 

24 

16 

+  7 

112 

"3 

60 

58 

56 

53 

50 

47 

44 

41 

37 

32 

28 

21 

14 

1*3 

114 

62 

60 

58 

55 

52 

50 

47 

43 

40 

35 

3i 

26 

19 

114 

115 
116 
117 
118 

64 
65 
67 
68 

62 
63 

11 

65? 

63 

64 

57 

8 

62 

1 

52 
57 

49 
51 
53 
55 

46 
48 
50 
52 

42 
45 
47 
49 

38 

8 

34 
37 
40 

43 

30 

33 
36 
39 

24 
28 

34 

"5 
116 
117 
118 

119 

70 

68 

66 

64 

61 

59 

57 

54 

48 

45 

42 

37 

119 

120 

71 

69 

67 

65 

63 

61 

59 

56 

53 

50 

47 

44 

40 

1  20 

121 

73 

71 

69 

67 

63 

60 

58 

55 

52 

50 

47 

43 

121 

122 

74 

72 

70 

68 

66 

64 

62 

60 

57 

54 

'  52 

49 

46 

122 

123 
124 

75 
77 

74 
75 

72 
73 

70 
71 

68 
69 

66 

67 

64 
65 

61 
63 

i? 

1 

3 

51 

53 

48 
50 

123 

124 

"5 

78 

76 

75 

73 

7i 

69 

67 

65 

63 

60 

58 

55 

52 

I25 

126 

80 

78 

76 

74 

73 

69 

64 

62 

60 

57 

54 

126 

127 
128 

81 
82 

I? 

78 
79 

76 
77 

74 
75 

72 
74 

70 
72 

70 

66 
68 

64 
65 

62 
63 

59 

61 

1 

128 

129 

84 

82 

80 

79 

77 

75 

73 

69 

67 

65 

63 

60 

I29 

130 

85 

83 

82 

80 

78 

76 

75 

73 

7i 

69 

67 

64 

62 

I30 

86 

85 

83 

81 

80 

78 

76 

74 

72 

70 

68 

66 

64 

131 

132 
133 

I7 
89 

86 

83 

84 

81 

82 

I? 

78 
79 

76 
77 

74 
75 

72 
73 

70 

68 
69 

67 

132 
133 

134 

90 

88 

87 

85 

84 

82 

80 

79 

77 

75 

73 

69 

134 

135 

91 

90 

88 

87 

85 

83 

82 

80 

78 

76 

75 

73 

7i 

135 

136 

92 

89 

88 

86 

85 

83 

81 

80 

78 

76 

74 

72 

136 

137 

94 

92 

•89 

88 

86 

84 

83 

81 

79 

78 

76 

74 

137 

138 

95 

93 

92 

90 

89 

87 

86 

84 

82 

81 

79 

77 

75 

138 

139 

96 

95 

93 

92 

90 

89 

87 

85 

84 

82 

80 

79 

77 

139 

140 

97 

96 

94 

93 

9i 

90 

88 

87 

85 

83 

82 

80 

78 

140 

t 

36°.  o 

37°-  o 

38°.  o 

39°-o 

40°.  o 

41°.  o 

42°.  o 

430.0 

44°.  o 

45°-o 

460.0 

47°.  o 

48°.  o 

t 

13 


Relative  humidity,  per  cent. 


J 

Difference  between  the  dry  and  wet  thermometers  (t  —  t'}. 

A 

1 

0°.2 

o°.4' 

o°.6 

o°.8 

i°.o 

*., 

i°.4 

,0.6 

,=.8 

2°.0 

2°.  2 

2°-4 

2°.  6 

Q 

—40 

58 

0> 

—40 

—39 

61 

•g 

(t-f) 

—39 

-38 

62 

*"  ^ 

-38 

—37 

65 

31 

5 

O°.  I 

6°.  2 

—37 

-36 

66 

35 

—36 

-35 

69 

38 

—  50 

62 

—35 

—34 

71 

43 

—  A.Q 

64 

—34 

—33 

73 

45 

-48 

67 

—33 

—32 

74 

48 

22 
^f- 

*f° 

—47 

f' 

69 

—32 

—  31 

75 

51 

2O 

—46 

71 

3i 

—30 

"f 

76 
78 
79 
80 
81 

82 

S 

8 
63 

30 

33 
37 
40 

43 
if. 

17 

21 
25 

28 

—45 
—44 
—43 
—42 
—41 

72 

74 
76 
78 
79 

45 
49 
52 
55 
57 

—30 
—29 
—28 
—27 
-26 

25 

—24 

83 

66 

40 
49 

32 

15 

—24 

—23 

84 

67 

35 

19 

• 

—23 

—  22 

84 

68 

53 

39 

23 

—  22 

—21 

85 

70 

56 

42 

27 

—  21 

—20 

86 

71 

58 

44 

30 

—  2O 

—19 

86 

73 

59 

47 

34 

20 

—I9 

—  18 

87 

74 

61 

49 

36 

23 

—  18 

—17 

88 

75 

63 

52 

39 

27 

16 

—17 

—  16 

88 

77 

65 

54 

42 

31 

20 

—  16 

—15 

89 

78 

66 

56 

45 

34 

23 

12 

—15 

—14 

89 

79 

68 

48 

37 

27 

16 

—14 

—13 

90 

80 

69 

60 

5° 

40 

3° 

20 

—13 

—  12 

90 

80 

62 

S2 

43 

24 

14 

—  12 

—  II 

91 

81 

72 

64 

54 

45 

36 

27 

18 

—  II 

—  IO 

9i 

82 

73 

64 

55 

47 

39 

30 

21 

13 

—  IO 

—  Q 

83 

74 

65 

57 

49 

42 

25 

17 

—  9 

—  8 

92 

84 

75 

59 

51 

43 

36 

28 

2O 

12 

—  8 

—  7 

92 

84 

76 

68 

61 

53 

45 

37 

31 

23 

16 

-  7 

—  6 

93 

85 

77 

7° 

63 

55 

48 

40 

34 

27 

20 

12 

—  6 

—  4 

93 
93 

86 
86 

78 
79 

72 

64 
65 

57 
59 

50 
52 

42 
45 

1 

3« 
32 

11 

16 
19 

9 
13 

—  5 
—  4 

—  2 

93 

87 

80 

73 

67 

60 

54 

47 

34 

29 

23 

16 

—  3 

—  2 

94 

87 

81 

74 

68 

62 

56 

49 

43 

37 

32 

26 

20 

—  2 

—  I 

94 

88 

82 

75 

69 

63 

57 

45 

39 

33 

29 

23 

—  I 

0 

94 

88 

82 

76 

7i 

65 

59 

53 

47 

42 

36 

3° 

24 

O 

I 

94 

89 

83 

77 

72 

66 

6! 

56 

49 

44 

38 

33 

28 

I 

2 

95 

89 

84 

78 

73 

68 

62 

57 

46 

36 

31 

2 

3 

95 

90 

84 

79 

74 

69 

64 

59 

53 

48 

43 

38 

33 

3 

4 

95 

90 

85 

80 

75 

70 

65 

60 

55 

50 

45 

40 

35 

4 

5 

95 

90 

86 

81 

76 

71 

66 

62 

57 

52 

47 

43 

38 

5 

6 

95 

91 

86 

81 

77 

72 

68 

63 

59 

54 

49 

45 

6 

7 

95 

91 

86 

82 

78 

73 

69 

64 

60 

56 

47 

43 

7 

8 

96 

92 

87 

83 

79 

74 

70 

66 

61 

57 

53 

49 

45 

8 

9 

96 

92 

87 

83 

79 

75 

67 

63 

59 

55 

47 

9 

10 

96 

92 

88 

«4 

80 

76 

72 

68 

64 

60 

56 

52 

48 

10 

ii 

96  . 

92 

88 

85 

81 

77 

73 

69 

65 

62 

58 

54 

50 

ii 

12 

96 

93 

89 

85 

81 

78 

74 

70 

66 

63 

59 

56 

52 

12 

I3 

96 

93 

89 

86 

82 

78 

75 

68 

64 

61 

57 

53 

13 

14 

96 

93 

90 

86 

83 

79 

76 

72 

69 

65 

62 

59 

55 

14 

15 

97 

93 

90 

87 

83 

80 

77 

73 

70 

67 

63 

60 

57 

15 

16 

97 

94 

90 

87 

84 

81 

77 

74  - 

68 

61 

58 

16 

17 

97 

94 

87 

84 

81 

78 

75 

72 

69 

66 

63 

60 

17 

18 

97 

94 

91 

88 

85 

82 

79 

76 

73 

70 

67 

64 

61 

18 

19 

97 

94 

9i 

88 

85 

82 

79 

76 

74 

68 

65 

62 

19 

20 

97 

94 

9i 

89 

86 

83 

80 

77 

74  ' 

72 

69 

66 

63 

20 

t 

0°.2 

o°.4 

o°.6 

o°.8 

,=.0 

I  •  2 

-.4 

,°.6 

,'.8 

2°.0 

2°.  2 

2°.  4 

2°.  6 

t 

14 


Relative  humidity,  per  cent. 


J 

Difference  between  the  dry  and  wet  thermometers  (t—  f  ). 

1 

Q 

20.6 

20.8 

3o.0 

3°.  2 

3°-  4 

3°.  6 

3°-8 

40.0 

4°.2 

40.4 

I 

—  2 

20 

14 

7 

—  2 

—  I 

23 

17 

ii 

—  I 

O 

26 

20 

15 

9 

0 

I 
2 

J5 

2 

18 

21 

Ii 

7 
ii 

4 

I 
2 

3 

33 

28 

24 

19 

14 

9 

4 

3 

4 

35 

3i 

26 

22 

18 

13 

8 

4 

5 
6 

7 

38 
43 

33 

Ii 

28 
31 

23 

a 

21 
23 
24 

16 
19 

22 

ii 
15 
18 

7 
10 

14 

6 
9 

5 

1 

7 

8 

45 

4i 

36 

31 

27 

24 

21 

17 

12 

9 

8 

9 

47 

43 

38 

33 

30 

26 

24 

20 

16 

12 

9 

10 

48 

45    41 

35 

32 

29 

26 

23 

19 

15 

10 

ii 

50 

46 

43 

38 

34 

31 

28 

24 

22     18 

ii 

12 
13 

52 
53 

48 
50 

JS 

43 

37 
39 

30 
32 

26 
29 

24 
25 

21 
22 

12 
13 

H 

55 

5i    48 

44 

38 

34 

28 

24 

14 

15 

57 

53    50 

46 

43 

40 

36 

34 

30 

27 

15 

16 

58 

54    52 

49 

45 

42 

38 

36 

33 

30 

16 

17 

60 

56    53 

51 

47 

44 

40 

38 

35 

32 

17 

18 

61 

57 

55 

52 

49 

46 

42 

40 

37 

34 

18 

19 

62 

59 

56 

54 

48 

45 

42 

39 

36 

19 

20 

63 

60 

58 

55 

53 

50 

47 

44 

4i 

38 

20 

< 

2o.6 

2°.  8 

3°-o 

3°-2 

3°-  4 

30.6 

3°.  8 

4°.o 

4°.  2 

40.4 

t 

t 

4°.  6 

4°.  8 

50.0 

5°-2 

5°-  4 

5°.  6 

50.8 

6°.o 

6°.  2 

60.4 

t 

8 

4 

8 

9 

8 

4 

9 

10 

ii 

7 

4 

10 

u 

M 

10 

7 

3 

ii 

12 

17 

14 

10 

7 

3 

12 

13 

20 

17 

13 

10 

7 

3 

13 

14 

23 

19 

16 

13 

10 

6 

3 

g 

25 
27 

22 
25 

19 

21 

16 
19 

II 

9 

13 

6 
10 

3 

6 

3 

15 

16 

Js 

29 

31 

3 

24 
27 

21 
24 

22 

15 

18 

13 
15 

10 
13 

7 
10 

4 
7 

17 

18 

19 

34 

31 

28 

26 

24 

21 

18 

16 

13 

10 

19 

20 

36 

33 

31 

27 

26 

23 

22 

18 

15 

13 

20 

t 

40.6 

4°.  8 

5°-o 

5°-2 

5°-4 

5°-6 

5°.  8 

60.0 

6°.  2 

6°.4 

t 

15 


Relative  humidity,  per  cent. 


to  "*"* 

Difference  between  the  dry  and  wet  thermometers  (t  —  t'). 

to  "*"* 

1 

o°.5 

10.0 

i°.5 

20.0 

2o.  5 

3°.o 

3°-5 

4°.o 

4°-  5 

50.0 

5°-  5 

6«.o 

1 

20 

93 

86 

79 

72 

65 

58 

5I 

44 

37 

30 

23 

18 

20 

21 

93 

86 

79 

73 

66 

59 

52 

45 

39 

32 

25 

19 

21 

22 

93 

86 

80 

73 

67 

60 

54 

47 

34 

28 

21 

22 

23 

24 

93 

94 

87 
87 

80 
81 

74 

75 

68 
69 

61 
62 

49 
50 

43 

44 

1 

30 
32 

2 

23 
24 

25 

94 

88 

82 

76 

70 

63 

57 

52 

46 

40 

34 

28 

25 

26 

94 

88 

82 

76 

71 

65 

59 

53 

47 

42 

36 

3° 

26 

27 

94 

89 

83 

72 

66 

60 

54 

49 

43 

38 

32 

27 

28 

95 

89 

83 

72 

67 

61 

56 

50 

45 

39 

34 

28 

29 

95 

89 

84 

78 

73 

67 

62 

57 

52 

47 

36 

29 

30 

95 

90 

84 

79 

73 

68 

63 

58 

53 

48 

43 

38 

30 

31 
32 

95 
95 

90 
90 

85 

79 
80 

74 
75 

69 
70 

64 
65 

59 
61 

3 

49 
51 

9 

40 

31 
32 

33 

95 

90 

85 

80 

76 

66 

62 

57 

52 

47 

43 

33 

34 

95 

90 

85 

81 

76 

72 

67 

63 

58 

53 

49 

44 

34 

35 

95 

9i 

86 

81 

77 

72 

68 

64 

59 

54 

50 

45 

35 

37 

96 
96 

9i 

86 
87 

82 

82 

77 
78 

73 
74 

69 
69 

64 

60 
61 

52 

9 

36 
37 

38 

96 

92 

87 

83 

79 

75 

70 

66 

62 

57 

53 

50 

38 

39 

96 

92 

88 

83 

79 

75 

7i 

67 

63 

58 

54 

51 

39 

40 

96 

92 

88 

84 

80 

76 

72 

68 

63 

59 

55 

52 

40 

41 

96 

92 

88 

84 

80 

76 

72 

68 

64 

60 

57 

53 

41 

42 

96 

92 

88 

84 

81 

77 

73 

69 

61 

58 

54 

42 

43 

96 

92 

88 

85 

81 

77 

74 

70 

66 

62 

58 

55 

43 

44 

96 

92 

88 

85 

8r 

78 

74 

70 

67 

63 

59 

56 

44 

9 

9 

96 
96 

92 
93 
93 

93 

89 
89 
89 
89 

85 
86 

82 
82 
83 
83 

78 
79 
79 
79 

75 

1 

72 

72 
73 

67 
68 
69 
69 

64 
66 

60 
61 
62 
63 

I 

i 

49 

97 

93 

90 

86 

83 

80 

76 

73 

70 

67 

63 

60 

49 

50 

97 

93 

90 

87 

83 

80 

77 

74 

70 

67 

64 

61 

50 

97 

93 

9° 

84 

81 

74 

68 

62 

52 

97 

94 

90 

87 

84 

81 

78 

75 

72 

69 

66 

63 

52 

53 
54 

97 
97 

94 
94 

87 
88 

84 
85 

81 
82 

78 
79 

9 

72 
73 

69 
70 

66 
67 

63 
64 

53 
54 

55 

56 

97 
97 

94 
94 

91 
91 

88 
88 

|5 

82 
82 

79 
80 

76 
77 

73 

74 

70 

68 
68 

65 
65 

11 

57 

97 

94 

91 

88 

86 

83 

80 

77 

74 

71 

69 

66 

57 

58 

97 

94 

89 

86 

83 

80 

78 

75 

72 

69 

67 

58 

59 

97 

94 

92 

89 

86 

83 

81 

78 

75 

72 

70 

67 

59 

-  60 
61 

97 
97 

94 
94 

92 
92 

89 
89 

86 
87 

8$ 

81 
81 

78 
78 

9 

73 
73 

70 

68 
68 

60 
61 

~  62 

97 

95 

92 

89 

87 

84 

81 

79 

76 

74 

7l 

69 

62 

63 

97 

95 

92 

89 

87 

84 

82 

79 

77 

74 

72 

69 

63 

64 

97 

95 

92 

90 

87 

85 

82 

79 

77 

74 

72 

70 

64 

65 

97 

95 

92 

90 

87 

85 

82 

80 

77 

75 

72 

70 

65 

66 

97 

95 

92 

90 

87 

85 

82 

80 

78 

75 

73 

66 

67 

98 

95 

93 

90 

88 

85 

83 

80 

78 

76 

73 

71 

67 

68 

98 

95 

93 

90 

88 

85 

83 

Si 

78 

76 

74 

71 

68 

69 

98 

95 

93 

90 

88 

86 

83 

81 

78 

76 

74 

72 

69 

70 

98 

95 

93 

90 

88 

86 

83 

81 

79 

77 

74 

72 

70 

71 

98 

95 

93 

88 

86 

84 

81 

79 

77 

75 

72 

71 

72 

98 

95 

93 

91 

88 

86 

84 

82 

79 

77 

75 

73 

72 

73 

98 

95 

93 

91 

88 

86 

84 

82 

80 

78 

75 

73 

73 

74 

98 

95 

93 

91 

88 

86 

84 

82 

80 

78 

76 

74 

74 

75 

98 

95 

93 

91 

89 

87 

84 

82 

80 

78 

76 

74 

75 

76 

98 

95 

93 

91 

89 

87 

85 

82 

80 

78 

76 

74 

76 

77 

98 

95 

93 

89 

87 

85 

83 

80 

78 

76 

74 

77 

78 

98 

96 

93 

g\ 

89 

87 

85 

83 

81 

79 

77 

75 

78 

79 

98 

96 

94 

91 

89 

87 

85 

83 

81 

79 

77 

75 

79 

80 

98 

96 

94 

92 

89 

87 

85 

83 

3  1 

79 

77  - 

75 

80 

< 

00.5 

,0.0 

,°.5 

2°.0 

2°.  5 

3°'o 

3°-  5 

4°.o 

4°.  5 

5°-o 

5°-5 

6°.o 

t 

16 


Relative  humidity,  per  cent. 


N 

Jq 

Difference  between  the  dry  and  wet  thermometers  (t  —  t'  . 

~! 

t*> 

>> 

;-, 

p 

6°.o 

60.  5 

7°.o 

7°-5 

8°.o 

8°.  5 

9°.o 

9°-5 

10°.  0 

10°.  5 

no.o 

i.°.5 

12°.  0 

| 

19 

16 

8 

2 

19 

20 

18 

ii 

5 

20 

21 

19 

14 

8 

21 

22 

21 

15 

ii 

4 

22 

23 

24 

17 

13 

7 

I 

23 

24 

26 

20 

16 

10 

4 

24 

25 

28 

22 

17 

12 

7 

2 

25 

26 

30 

24 

19 

14 

10 

4 

26 

27 

32 

27 

22 

16 

12 

7 

2 

27 

28 

34 

29 

24 

19 

14 

10 

5 

28 

29 

36 

31 

26 

21 

16 

ii 

7 

3 

29 

30 

38 

33 

28 

23 

18 

13 

10 

5 

30 

40 

35 

30 

25 

21 

16 

ii 

8 

3 

31 

32 

37 

32 

28 

23 

18 

14 

10 

6 

I 

32 

33 

43 

38 

34 

29 

25 

20 

16 

12 

8 

4 

33 

34 

44 

40 

35 

31 

27     22 

18 

14 

10 

7 

3 

34 

1 

45 
47 
48 
50 

43 

3 

37 
38 
40 
42 

33 

| 

38 

29 
30 
32 

34 

24 
26 
28 
3° 

20 
22 
24 
26 

16 
18 
20 

22 

12 

14 
16 
18 

8 
10 

12 
15 

5 
7 
9 
ii 

I 

4 
6 

8 

2 

5 

11 
II 

39 

51 

47 

43 

39 

35 

32 

28 

24 

20 

17 

13 

9 

7 

39 

40 

52 

48 

44 

41 

37 

33 

30 

26 

22 

19 

15 

ii 

8 

40 

41 

53 

49 

46 

42 

38 

35 

31 

28 

24 

21 

17 

13 

10 

41 

42 

54 

50 

47 

43 

40 

36 

33 

29 

26 

22 

19 

15 

12 

42 

43 

55 

51 

48 

45 

38 

34 

31 

28 

24 

21 

17 

14 

43 

44 

56 

52 

49 

46 

43 

39 

36 

32 

29 

26 

23 

19 

16 

44 

45 

57 

53 

50 

47 

44 

40 

34 

31 

28 

24 

21 

18 

45 

46 

58 

54 

51 

48 

45 

42 

35 

32 

29 

26 

23 

20 

46 

47 
48 

59 
60 

P 

52 
53 

49 
50 

46 
47 

43 

44 

40 

37 

38 

34 

31 
32 

28 
29 

5 

22 
23 

JS 

49 

60 

57 

54 

48 

45 

42 

39 

36 

33 

30 

28 

25 

49 

50 

61 

58 

55 

52 

49 

46 

43 

•40 

37 

35 

32 

29 

26 

50 

52 

62 

59 
60 

57 

53 
54 

50 
51 

48 

8 

42 
43 

39 
40 

37 

33 

30 
32 

28 
29 

51 
52 

53 

63 

61 

58 

55 

52 

49 

47 

44 

41 

38 

36 

33 

31 

53 

54 

64 

61 

59 

56 

53 

50 

48 

45 

42 

39 

37 

34 

32 

54 

55 

65 

62 

59 

57 

54 

5I 

49 

46 

43 

40 

38 

36 

33 

55 

56 

65 

63 

60 

57 

55 

52 

50 

47 

44 

42 

39 

37 

56 

57 
58 

67 

64 
64 

61 
61 

59 

55 
56 

53 
53 

50 
51 

48 
49 

8 

43 
44 

40 
42 

38 
39 

37 

59 

67 

65 

62 

60 

57 

54 

52 

49 

47 

45 

43 

40 

38 

59 

60 

68 

65 

63 

60 

58 

55 

53 

50 

48 

46 

44 

4i 

39 

60 

61 

68 

66 

63 

61 

58 

56 

54 

51 

49 

47 

44 

42 

40 

61 

62 
63 

69 

69 

66 
67 

64 

64 

61 
62 

59 
60 

57 
57 

54 
55 

52 

53 

50 

5i 

47 
48 

35 
46 

43 

44 

41 
42 

62 
63 

64 

70 

67 

65 

62 

60 

58 

56 

53 

49 

47 

45 

43 

64 

65 

70 

68 

65 

63 

61 

59 

56 

54 

52 

50 

48 

46 

44 

65 

66 

71 

68 

66 

63 

61 

59 

57 

55 

53 

49 

47 

45 

66 

68 

7i 

69 

66 

67 

64 
65 

62 
63 

60 
60 

58 
58 

53 

54 

52 

49 
50 

9 

8 

68 

69 

72 

70 

67 

65 

63 

61 

59 

57 

55 

53 

49 

47 

69 

70 

72 

70 

68 

66 

64 

62 

60 

57 

55 

53 

52 

5° 

48 

70 

71 

72 

70 

68 

66 

64 

62 

60 

58 

56 

54 

52 

50 

48 

7* 

72 

73 

71 

69 

67 

6S 

63 

61 

59 

57 

55 

53 

49 

72 

73 

73 

71 

69 

65 

63 

61 

59 

57 

55 

53 

52 

50 

73 

74 

74 

72 

70 

68 

66 

64 

62 

60 

58 

56 

54 

52 

50 

74 

75 

74 

72 

70 

68 

66 

64 

62 

60 

58 

56 

55 

53 

51 

75 

76 

74 

72 

70 

68 

66 

64 

63 

61 

59 

57 

53 

52 

76 

77 

74 

73 

71 

69 

67 

65 

63 

61 

59 

57 

56 

54 

52 

77 

78 

75 

73 

71 

69 

67 

65 

63 

62 

60 

58 

56 

54 

53 

78 

79 

75 

73 

7i 

70 

68 

66 

64 

62 

60 

58 

57 

55 

53 

79 

80 

75 

73 

72 

70 

68 

66 

64 

63 

61 

59 

57 

55 

54 

80 

| 

6°.o 

6°-  5 

7°.o 

7°-  5 

S°.o 

8°.  5 

9°.o 

9°-  5 

10°.  0 

10°.  5 

,,0.0 

n°-5 

12°.  0 

t 

17 


Relative  humidity,  per  cent. 


J 

Difference  between  the  dry  and  wet  thermometers  (t  —  t'  ). 

A 

Q 

12°.  0 

12°.  5 

13°.  o 

13  •  5 

14°.  o 

i4°-  5 

15°.  o 

i5°-  5 

i6°.o 

160-5 

170.0 

i7°-5 

i8°.o 

Q 

40 

8 

6 

2 

40 

41 

10 

8 

4 

i 

41 

42 

12 

9 

6 

3 

42 

43 

14 

ii 

8 

6 

2 

43 

44 

16 

13 

10 

7 

5 

2 

44 

45 

18 

15 

12 

9 

6 

4 

i 

45 

46 

20 

17 

14 

ii 

8 

6 

3 

46 

47 

22 

19 

16 

13 

10 

7 

2 

47 

48 

23 

20 

18 

15 

12 

9 

6 

4 

2 

48 

49 

25 

22 

19 

17 

14 

ii 

8 

5 

4 

i 

49 

50 

26 

23 

21 

18 

16 

13 

10 

7 

5 

3 

i 

50 

51 

28 

25 

22 

20 

17 

15 

12 

9 

7 

5 

3 

52 

29 

26 

24 

21 

19 

16 

13 

ii 

9 

6 

4 

2 

52 

53 

31 

28 

25 

23 

20 

18 

15 

13 

10 

8 

5 

4 

2 

53 

54 

32 

29 

27 

24 

22 

19 

17 

14 

12 

10 

7 

5 

3 

54 

1 

33 

34 

31 
32 

28 
30 

26 
27 

23 

25 

21 
22 

18 

20 

16 
17 

14 
15 

ii 
13 

9 
ii 

7 

8 

4 
6 

56 

36 

33 

31 

28 

26 

24 

21 

19 

17 

12 

10 

8 

57 

58 

37 

34 

32 

29 

27 

25 

23 

20 

18 

16 

14 

12 

10 

58 

59 

38 

36 

33 

31 

29 

26 

24 

22 

20 

17 

15 

13 

ii 

59 

60 
61 

39 
40 

i 

34 
35 

32 

33 

30 
31 

28 
29 

25 

27 

23 
24 

21 
22 

19 

20 

17 

18 

3 

13 
14 

60 
61 

62 

39 

37 

34 

32 

30 

28 

26 

24 

22 

20 

18 

16 

62 

63 

42 

40 

38 

33 

31 

29 

27 

25 

23 

21 

I9 

17 

63 

64 

43 

38 

36 

34 

32 

3° 

28 

26 

24 

22 

20 

18 

64 

65 

44 

42 

39 

37 

35 

33 

31 

29 

27 

25 

24 

22 

20 

65 

66 

45 

42 

40 

38 

36 

34 

32 

30 

29 

25 

23 

21 

66 

67 

45 

43 

39 

37 

33 

32 

30 

28 

26 

24 

22 

67 

68 

46 

44 

42 

40 

38 

36 

34 

33 

31 

29 

27 

25 

23 

68 

69 

47 

45 

43 

39 

37 

35 

33 

32 

30 

28 

26 

24 

69 

70 

48 

46 

44 

42 

40 

38 

36 

34 

33 

31 

29 

27 

26 

70 

71 

48 

46 

45 

43 

41 

39 

37 

34 

32 

30 

28 

27 

71 

72 

49 

47 

45 

43 

42 

40 

38 

36 

35 

33 

31 

30 

28 

72 

73 

5° 

48 

46 

44 

42 

41 

39 

37 

34 

32 

30 

29 

73 

74 

50 

48 

47 

45 

43 

4i 

40 

38 

36 

35 

33 

31 

30 

74 

75 
76 

52 

49 
50 

g 

46 
46 

44 
45 

42 
43 

40 

39 
39 

1 

35 

34 
35 

32 

33 

31 
31 

M 

77 

52 

50 

49 

47 

45 

44 

42 

40 

39 

37 

34 

32 

77 

78 

53 

51 

49 

48 

46 

44 

43 

41 

39 

38 

36 

35 

33 

78 

79 

53 

52 

50 

48 

47 

45 

43 

42 

40 

39 

37 

36 

34 

79 

80 

54 

52 

51 

49 

47 

45 

44 

42 

41 

39 

38 

36 

35 

80 

t 

12°.  0 

12°.  5 

13°.  o 

i3°-5 

14°.  o 

*4°-5 

,5'.. 

I5°-  5 

160.0 

i6°.5 

170.0 

i7°-5 

i8°.o 

t 

18 


Relative  humidity,  per  cent. 


o 

Q) 

,g 

Difference  between  the  dry  and  wet  thermometers  (t—  t"). 

72 

""  >, 

1 

""  >, 

Q 

i8°.o 

19°.  o 

20°.  0 

21°.  0 

22°.  0 

23°.  o 

24°.  o 

25°.  o 

26°.0 

27°.  o 

28°.  o 

29°.  o  30°.  o 

Q 

55 

4 

i 

55 

56 

6 

3 

S^ 

57 

8 

57 

58 

10 

6 

2 

58 

59 

ii 

8 

4 

59 

60 

13 

9 

, 

I 

60 

61 
62 

\i 

10 

12 

8 

3 
5 

I 

61 
62 

63 

17 

13 

9 

6 

3 

63 

64 

18 

15 

ii 

7 

4 

I 

64 

65 

20 

16 

12 

9 

6 

2 

65 

66 

21 

17 

H 

10 

7 

4 

I 

66 

67 

22 

19 

12 

g 

5 

2 

67 

68 

23 

20 

16 

13 

10 

6 

4 

o 

68 

69 

24 

21 

18 

ii 

8 

5 

2 

69 

70 

26 

22 

19 

16 

12 

9 

6 

3 

o 

70 

71 

27 

23 

20 

17 

H 

10 

7 

5 

2 

72 

28 

24 

21 

18 

15 

12 

9 

6 

3 

0 

72 

73 

29 

25 

22 

19 

16 

13 

10 

7 

4 

2 

73 

74 

30 

26 

23 

20 

17 

H 

ii 

8 

6 

3 

o 

74 

75 

31 

27 

24 

21 

18 

15 

12 

9 

7 

4 

2 

75 

76 

31 

28 

25 

22 

19 

16 

14 

ii 

8 

5 

3 

o 

76 

77 

32 

29 

26 

23 

20 

17 

12 

9 

6 

4 

2 

77 

78 

33 

30 

27 

24 

21 

18 

16 

13 

10 

8 

5 

3 

o 

78 

79 

34 

31 

28 

25 

22 

19 

17 

H 

ii 

9 

6 

4 

2 

79 

80 

35 

32 

29 

26 

23 

20 

18 

15 

13 

10 

7 

5 

3 

80 

< 

i8°.o 

19°.  o 

20°.  0 

21°.  0 

22°.  0 

'23°.  o 

24°.  o 

25°.  o 

26°.  o 

27°.  o 

28°.  o 

29°.  o 

30°.  o 

t 

19 


Relative  humidity,  per  cent. 


e 

Difference  between  the  dry  and  wet  thermometers  (  t  —  V  ). 

<D 

P 

i°.o  20.0 

30.0 

4°.o 

5°-o 

6°.o 

70.0 

80.o 

g°.o 

10°. 

n°.o 

12°. 

Q 

80 

96 

92 

87 

83 

79 

75 

72 

68 

64 

61 

57 

54 

80 

81 

96 

92 

88 

84 

80 

76 

72 

68 

65 

61 

58 

54 

Si 

82 

96    92 

88 

84 

80 

76 

72 

69 

65 

62 

58 

55 

82 

83 

96    92 

88 

84 

80 

76 

73 

69 

66 

62 

59 

83 

84 

96 

92 

88 

84 

So 

77 

73 

69 

66 

63 

59 

56 

84 

85 

96 

92 

88 

84 

So 

77 

73 

70 

66 

63 

60 

56 

85 

86 

96 

92 

88 

84 

81 

77 

73 

70 

67 

63 

60 

57 

86 

87 

96 

92 

88 

84 

81 

77 

74 

70 

67 

64 

60 

57 

87 

88 

96 

92 

88 

85 

81 

77 

74 

67 

64 

61 

58 

88 

89 

96 

92 

88 

85 

Si 

78 

74 

71 

68 

64 

61 

58 

89 

90 

96 

92 

88 

85 

81 

78 

75 

71 

68 

65 

62 

59 

90 

96 

92 

89 

85 

82 

78 

75 

71 

68 

65 

62 

59 

91 

92 

96 

92 

89 

85 

82 

78 

75 

72 

69 

65 

62 

59 

92 

93 

96 

93 

89 

85 

82 

78 

75 

72 

69 

66 

63 

60 

93 

94 

96 

93 

89 

86 

82 

79 

75 

72 

69 

66 

63 

60 

94 

95 

96 

93 

89 

86 

82 

79 

76 

72 

69 

66 

63 

60 

95 

96 

96 

93 

89 

86 

82 

79 

76 

73 

70 

67 

64 

61 

96 

97 

96 

93 

89 

86 

82 

79 

76 

73 

70 

67 

64 

61 

98 

96 

93 

89 

86 

83 

79 

76 

73 

70 

64 

61 

98 

99 

96 

93 

89 

86 

83 

80 

76 

73 

70 

68 

65 

62 

99 

IOO 

97 

93 

90 

86 

83 

80 

77 

74 

7i 

68 

65 

62 

IOO 

1OI 

97 

93 

90 

86 

83 

80 

77 

74 

71 

68 

65 

62 

101 

102 

97 

93 

90 

86 

83 

80 

77 

74 

71 

68 

65 

63 

1  02 

103 

97 

93 

90 

87 

83 

80 

77 

74 

7i 

69 

66 

63 

103 

104 

97 

93 

90 

87 

83 

80 

77 

74 

72 

69 

66 

63 

104 

105 

97 

93 

90 

87 

84 

81 

78 

75 

72 

69 

66 

64 

105 

106 

97 

93 

90 

87 

84 

81 

78 

75 

72 

69 

66 

64 

106 

107 

97 

93 

90 

87 

84 

81 

78 

75 

72 

69 

67 

64 

107 

1  08 

97 

93 

90 

87 

84 

81 

78 

75 

72 

70 

67 

64 

108 

109 

97 

93 

90 

87 

84 

81 

78 

75 

73 

70 

67 

65 

109 

no 

97 

94 

90 

87 

84 

81 

78 

76 

73 

70 

67 

65 

no 

in 

97 

94 

90 

87 

84 

81 

78 

76 

73 

70 

68 

65 

in 

112 

97 

94 

90 

87 

84 

82 

79 

76 

73 

68 

112 

"3 

97 

94 

90 

87 

85 

82 

79 

76 

73 

71 

68 

66 

"3 

114 

97 

94 

88 

85 

82 

79 

76 

74 

7i 

68 

66 

114 

"5 

97 

94 

9i 

88 

85 

82 

79 

76 

74 

7i 

69 

66 

"5 

116 

97 

94 

91 

88 

85 

82 

79 

76 

74 

71 

69 

66 

116 

117 

97 

94 

91 

88 

85 

82 

79 

77 

74 

71 

69 

66 

117 

118 

97 

94 

91 

88 

85 

82 

79 

77 

74 

72 

69 

67 

118 

119 

97 

94 

9i 

88 

85 

82 

80 

77 

74 

72 

69 

67 

119 

1  20 

97 

94 

91 

S8 

85 

83 

80 

77 

75 

72 

70 

67 

120 

121 

97 

94 

91 

88 

84 

83 

80 

77 

75 

72 

70 

67 

121 

122 

97 

94 

91 

88 

85 

83 

80 

77 

75 

72 

70 

122 

I23 

97 

94 

91 

88 

85 

83 

80 

78 

75 

73 

70 

68 

123 

124 

97 

94 

91 

88 

85 

83 

80 

78 

75 

73 

70 

68 

124 

125 

97 

94 

91 

88 

86 

83 

80 

78 

75 

73 

70 

68 

125 

126 

97 

94 

91 

88 

86 

83 

80 

78 

75 

73 

71 

68 

126 

127 

97 

94 

91 

89 

86 

83 

81 

78 

76 

73 

68 

127 

128 

97 

94 

gi 

89 

86 

83 

81 

78 

76 

73 

71 

68 

128 

I29 

97 

94 

91 

89 

86 

83 

81 

78 

76 

73 

7i 

69 

I29 

I30 

97 

94 

91 

89 

86 

83 

81 

78 

76 

74 

7i 

69 

130 

97 

94 

92 

89 

86 

84 

81 

79 

76 

74 

7i 

69 

I32 

97 

94 

92 

89 

86 

84 

81 

79 

76 

74 

72 

69 

132 

133 

97 

94 

92 

89 

86 

84 

81 

79 

76 

74 

72 

69 

133 

134 

97 

94 

92 

89 

86 

84 

81 

79 

76 

74 

72 

70 

134 

135 

97 

94 

92 

89 

86 

84 

81 

79 

77 

74 

72 

70 

135 

136 

97 

94 

92 

89 

87 

84 

82 

79 

77 

74 

72 

70 

136 

97 

94 

92 

89 

87 

84 

82 

79 

77 

74 

72 

70 

137 

138 

97 

95 

92 

89 

87 

84 

82 

79 

77 

74 

73 

70 

138 

139 

97 

95 

92 

89 

87 

84 

82 

79 

77 

75 

73 

70 

139 

140 

97 

95 

92 

89 

87 

84 

82 

79 

77 

75 

73 

7i 

140 

t 

.0.0 

2°.0 

3°-o 

4°.o 

5°-o 

6°.o 

7°.o 

8°.o 

o.o 

o°.o 

,0.0 

12°.  0 

t 

20 


Relative  humidity,  per  cent. 


a 

<D 

-Ki  "** 

Difference  between  the  dry  and  wet  thermometers  (t—  t'  ). 

A 

5 

12°.  0 

I30.o 

I4°- 

15°. 

16°. 

17°. 

i8°.o 

igO. 

20°. 

21°. 

22°. 

23°.  o  24°. 

1 

so 

54 

51 

47 

44 

4i 

38 

35 

32 

29 

26 

23 

20 

18 

80 

81 

54 

51 

48 

44 

41 

38 

35 

33 

30 

27 

24 

21 

19 

81 

82 

55 

S2 

48 

45 

42 

39 

36 

33 

31 

28 

25 

22 

20 

82 

83 

55 

52 

49 

46 

43 

40 

37 

34 

31 

29 

26 

23 

21 

83 

84 

56 

53 

49 

46 

44 

.  4i 

38 

35 

32 

29 

27 

24 

22 

84 

85 

56 

53 

50 

47 

44 

41 

38 

36 

33 

30 

28 

25 

22 

85 

86 

57 

54 

48 

45 

42 

39 

36 

34 

31 

29 

26 

23 

86 

87 

57 

54 

51 

48 

45 

42 

40 

37 

34 

32 

30 

27 

24 

87 

88 

58 

55 

52 

49 

46 

43 

40 

38 

32 

3° 

27 

25 

88 

89 

58 

55 

52 

49 

46 

44 

38 

36 

33 

31 

28 

26 

89 

90 

59 

56 

53 

50 

47 

44 

41 

39 

36 

34 

32 

29 

26 

90 

9r 

59 

56 

53 

5° 

47 

45 

42 

39 

37 

35 

33 

30 

27 

92 

59 

56 

54 

51 

48 

45 

43 

40 

37 

35 

33 

30 

28 

92 

93 

60 

57 

54 

51 

48 

46 

43 

41 

38 

36 

34 

31 

29 

93 

94 

60 

57 

54 

52 

49 

46 

44 

4i 

39 

36 

34 

31 

29 

94 

95 
96 

60 
61 

58 
58 

55 
55 

52 
53 

49 
50 

47 
47 

44 
45 

42 
42 

39 
40 

37 

35 

32 

33 

30 
3« 

9 

97 

61 

58 

56 

53 

50 

48 

45 

43 

40 

38 

36 

33 

31 

97 

98 

61 

59 

56 

53 

51 

48 

46 

43 

38 

37 

34 

32 

98 

99 

62 

59 

56 

54 

5i 

49 

46 

44 

4i 

39 

37 

34 

32 

99 

100 

62 

59 

57 

54 

5i 

49 

47 

44 

42 

39 

37 

35 

33 

IOO 

101 

62 

60 

57 

54 

52 

49 

47 

45 

42 

40 

38 

36 

33 

tor 

1  02 

63 

60 

57 

55 

52 

50 

47 

45 

43 

40 

38 

36 

34 

102 

103 

63 

60 

58 

55 

53 

50 

48 

45 

43 

39 

37 

34 

103 

104 

63 

61 

58 

55 

53 

51 

48 

46 

44 

4i 

39 

37 

35 

104 

105 

64 

61 

58 

56 

53 

51 

49 

46 

44 

42 

40 

38 

35 

105 

106 

64 

6r 

59 

56 

54 

49 

47 

44 

42 

40 

38 

36 

106 

107 

64 

62 

59 

57 

54 

52 

49 

47 

45 

43 

38 

36 

107 

1  08 

64 

62 

59 

57 

54 

52 

5° 

47 

45 

43 

4r 

39 

37 

108 

109 

65 

62 

60 

57 

55 

52 

50 

48 

46 

44 

4i 

39 

37 

109 

no 

65 

62 

60 

57 

55 

53 

50 

48 

46 

44 

42 

40 

38 

no 

in 

65 

63 

60 

58 

53 

'  49 

46 

44 

42 

40 

38 

in 

112 

65 

63 

60 

58 

56 

53 

51 

49 

47 

45 

43 

40 

39 

112 

"3 

66 

6^5 

61 

58 

56 

54 

51 

49 

47 

45 

43 

41 

39 

"3 

114 

66 

63 

61 

59 

56 

54 

52 

50 

48 

45 

44 

4i 

39 

114 

"5 

66 

64 

61 

59 

57 

54 

52 

50 

48 

46 

44 

42 

40 

"5 

116 

66 

04 

61 

59 

57 

55 

52 

50 

48 

46 

44 

42 

40 

116 

117 

66 

64 

62 

59 

57 

55 

53 

49 

46 

44 

43 

117 

118 

67 

64 

62 

60 

57 

55 

53 

51 

49 

47 

45 

43 

41 

118 

119 

67 

64 

62 

60 

58 

55 

53 

5i 

49 

47 

45 

43 

41 

119 

120 

67 

65 

62 

60 

58 

56 

54 

51 

49 

47 

45 

44 

42 

120 

121 

67 

65 

63 

60 

58 

56 

54 

52 

5° 

48 

46 

44 

42 

121 

122 

67 

65 

63 

61 

58 

56 

54 

52 

50 

48 

46 

44 

42 

122 

123 

68 

65 

63 

61 

59 

57 

54 

52 

50 

48 

46 

45 

43 

I23 

124 

68 

66 

63 

6r 

59 

57 

55 

53 

49 

47 

45 

43 

124 

125 
126 

68 
68 

66 
66 

64 
64 

62 
62 

59 
59 

57 
57 

55 
55 

53 
53 

5J 

49 
49 

47 
47 

45 
46 

43 

44 

3 

127 

68 

66 

64 

62 

60 

58 

55 

54 

52 

50 

48 

46 

44 

127 

128 

68 

66 

64 

62 

60 

58 

5<J 

54 

52 

50 

48 

46 

44 

128 

I29 

69 

66 

64 

62 

60 

58 

56 

54 

52 

50 

48 

46 

45 

129 

I30 

69 

67 

65 

62 

60 

58 

56 

54 

52 

50 

49 

47 

45 

130 

131 

69 

67 

65 

63 

60 

58 

56 

54 

53 

51 

49 

47 

46 

132 

69 

67 

65 

63 

61 

59 

57 

55 

53 

49 

47 

46 

132 

133 

69 

67 

65 

63 

61 

59 

57 

55 

53 

51 

49 

48 

46 

134 

70 

67 

65 

63 

61 

59 

57 

55 

53 

5i 

50 

48 

46 

i34 

I35 

70 

68 

65 

63 

61 

59 

57 

55 

53 

51 

50 

48 

46 

i35 

136 

70 

68 

66 

64 

61 

59 

58 

56 

54 

52 

50 

48 

47 

136 

137 

70 

68 

66 

64 

62 

60 

58 

56 

54 

52 

5° 

49 

47 

i37 

138 

70 

68 

66 

64 

62 

60 

58 

56 

54 

52 

49 

47 

138 

139 

70 

68 

66 

64 

62 

60 

58 

56 

54 

53 

51 

49 

47 

.140 

71 

68 

66 

64 

62 

60 

58 

56 

55 

53 

5< 

49 

48 

140 

t 

2°.0 

3°-o 

4°.o 

5°-o 

6°.o 

17°.  o 

8°.o 

9°.o 

o°.o 

i°.o 

2°.0 

3°-o 

24°.  o 

t 

21 


Relative  humidity,  per  cent. 


1 

Difference  between  the  dry  and  wet  thermometers  (t  —  t'  . 

J 

Q 

24°.  o  25°.  o 

26°.  o 

27°.  o 

28°.  o  29°.  o 

30°.  o 

310.0 

32°.  o 

33°-o 

34°.  o 

35°-o 

36°.  o 

cj 

80 

18 

15 

13 

10 

7 

5 

3 

i 

so 

81 

19 

16 

II 

9 

6 

4 

2 

81 

82 

20 

17 

15 

12 

10 

7 

5 

3 

I 

82 

83 

21 

18 

16 

13 

n 

8 

6 

4 

2 

83 

84 

22 

19 

17 

14 

12 

9 

7 

5 

3 

i 

84 

85 

22 

20 

17 

15 

13 

10 

8 

6 

4 

2 

85 

86 

23 

21 

18 

16 

n 

9    7 

3 

i 

86 

87 

24 

22 

19 

17 

15 

12 

10 

8 

6 

4 

2 

87 

88 

22 

20 

18 

16 

13 

n 

9 

7 

3 

i 

88 

89 

26 

23 

21 

19 

16 

14 

12 

10 

8 

6 

4 

2 

0 

89 

90 
91 

26 
27 

24 
25 

22 
23 

20 
2O 

g 

\l 

13 

<4 

n 

12 

9 
10 

| 

1 

3 

4 

i 

2 

90 
91 

92 
93 

28 
29 

26 
26 

23 
24 

21 
22 

19 

20 

% 

15 
16 

13 
14 

n 

12 

9 

10 

I 

| 

3 
4 

92 
93 

94 

29     27 

25 

23 

21 

18 

16 

14 

13 

n 

9 

7 

5 

94 

95 
96 

30 
3° 

28 
28 

25 
26 

23 

24 

21 
22 

19 

20 

17 

18 

\l 

13 
14 

n 

12 

10 
10 

8 
9 

6 

95 
96 

97 

31 

29 

27 

25 

23 

21 

19 

17 

13 

ii 

10 

8 

97 

98 

32 

29 

27 

25 

23 

21 

19 

18 

16 

H 

12 

10 

9 

98 

99 

32 

30 

28 

26 

24 

22 

20 

18 

16 

15 

13 

II 

9 

99 

IOO 

33 

31 

29 

27 

25 

23 

21 

19 

17 

*5 

14 

12 

10 

IOO 

101 

33 

31 

29 

27 

25 

23 

21 

20 

18 

16 

14 

13 

n 

101 

102 

34 

32 

30 

28 

26 

24 

22 

20 

19 

17 

15 

13 

12  ' 

IO2 

103 

34 

32 

30 

28 

26 

25 

23 

21 

19 

17 

16 

14 

12 

103 

104 

35 

33 

31 

29 

27 

25 

23 

22 

20 

18 

16 

15 

13 

104 

105 

35 

33 

31 

3° 

28 

26 

24 

22 

20 

19 

17 

15 

14 

105 

106 

36 

34 

32 

30 

28 

26 

25 

23 

21 

19 

18 

16 

«4 

106 

107 

36 

34 

32 

3i 

29 

27 

23 

22 

20 

18 

17 

15 

107 

108 

37 

35 

33 

3i 

29 

27 

26 

24 

22 

21 

19 

17 

16 

108 

109 

37 

35 

33 

32 

30 

28 

26 

25 

23 

21 

20 

18 

16 

109 

no 

38 

36 

34 

32 

30 

28 

27 

25 

23 

22 

2O 

19 

17 

no 

in 

38 

36 

34 

33 

31 

29 

27 

26 

24 

22 

21 

19 

18 

in 

112 

39 

37 

35 

33 

31 

29 

28 

26 

24 

23 

21 

20 

18 

112 

"3 

39 

37 

35 

33 

32 

30 

28 

27 

25 

23 

22 

20 

19 

"3 

114 

39 

38 

36 

34 

32 

30 

29 

27 

25 

24 

22 

21 

19 

114 

"5 

40 

38 

36 

34 

33 

31 

29 

28 

26 

24 

23 

21 

20 

"5 

116 

40 

39 

37 

35 

33 

31 

30 

28 

26 

25 

23 

22 

2O 

116 

117 

41 

39 

37 

35 

33 

32 

30 

29 

27 

25 

24 

22 

21 

117 

118 

4i 

39 

36 

34 

32 

31 

29 

27 

26 

24 

23 

21 

118 

119 

4r 

40 

38 

36 

34 

33 

31 

29 

28 

26 

25 

23 

22 

119 

1  20 

42 

40 

38 

36 

35 

33 

31 

30 

28 

27 

25 

24 

22 

1  20 

121 

42 

40 

38 

37 

35 

33 

32 

29 

27 

26 

24 

23 

121 

122 

42 

41 

39 

37 

35 

34 

32 

31 

29 

28 

26 

25 

23 

122 

123 

43 

41 

39 

37 

36 

34 

33 

31 

29 

28 

26 

25 

24 

123 

124 

43 

4i 

40 

38 

36 

35 

33 

31 

30 

28 

27 

25 

24 

124 

125 

43 

42 

40 

38 

37 

35 

33 

32 

3° 

29 

27 

26 

24 

125 

126 

44 

42 

40 

39 

37 

35 

34 

32 

31 

29 

28 

26 

25 

126 

127 

44 

42 

39 

36 

34 

32 

31 

30 

28 

27 

25 

127 

128 

44 

43 

41 

39 

38 

36 

34 

33 

29 

27 

26 

128 

129 

45 

43 

4i 

40 

38 

36 

35 

33 

32 

30 

29 

28 

26 

129 

130 

45 

43 

42 

40 

38 

37 

35 

33 

32 

31 

29 

28 

27 

130 

131 

45 

44 

42 

40 

39 

37 

35 

34 

32 

31 

30 

28 

27 

131 

132 

46 

44 

42 

40 

39 

37 

36 

34 

33 

31 

30 

29 

27 

132 

133 

46 

44 

42 

39 

38 

36 

35 

33 

32 

30 

29 

28 

133 

134 

46 

44 

43 

4i 

39 

38 

36 

35 

33 

32 

31 

29 

28 

134 

135 

46 

45 

43 

4i 

40 

38 

37 

35 

34 

32 

31 

30 

28 

'35 

136 

47 

45- 

43 

42 

40 

39 

37 

36 

34 

33 

31 

3° 

29 

136 

137 

47 

45 

44 

42 

40 

39 

37 

36 

34 

33 

32 

30 

29 

137 

138 

47 

45 

44 

42 

41 

39 

38 

36 

35 

33 

32 

31 

30 

138 

139 

47 

46 

44 

42 

4i 

39 

38 

37 

35 

34 

32 

3i 

30 

139 

140 

48 

46 

44 

43 

4i 

40 

38 

37 

35 

34 

33 

3* 

30 

140 

t 

24°.  o 

25°.  o 

26°.  o 

270.0 

28°.  o 

29°.  o 

30°.  o 

31°.  o 

32°.  o 

33°-° 

34°-o 

35°-o 

360.0 

t 

22 


Relative  humidity,  per  cent. 


M 

£ 

Difference  between  the  dry  and  wet  thermometers  (  t  —  t'  . 

M 

Q 

36°.  o 

37°-o 

38°-o 

39°.  o 

40°.  o 

4i°.o 

42°.  o  43°.  o 

440.0 

45°-  o 

460.0 

470.0 

48°.  o 

t~i 

Q 

89 

0 

89 

90 

i 

90 

qj 

2 

i 

QI 

92 

3 

2 

92 

93 

4 

2 

i 

93 

94 

5 

3 

2 

94 

95 

6 

4 

3 

i 

95 

96 

7 

5 

3 

2 

o 

96 

97 

8 

6 

4 

3 

I 

97 

98 

9 

7 

5 

4 

2 

i 

98 

99 

9 

8 

6 

5 

3 

i 

99 

100 

10 

9 

7 

5 

4 

2 

I 

IOO 

101 

n 

9 

8 

6 

5 

3 

2 

O 

101 

IO2 

12 

10 

9 

7 

5 

4 

2 

I 

I 

1  02 

103 

12 

n 

9 

8 

6 

5 

3 

2 

I 

103 

104 

13 

12 

10 

8 

7 

6 

4 

3 

I 

104 

105 

H 

12 

n 

9 

8 

6 

5 

4 

2 

i 

105 

106 

14 

13 

n 

10 

8 

7 

6 

4 

3 

2 

o 

106 

107 

15 

12 

II 

9 

8 

6 

5 

4 

3 

i 

107 

1  08 

16 

14 

13 

n 

10 

9 

7 

6 

4 

3 

2 

I 

1  08 

109 

16 

15 

13 

12 

10 

9 

8 

6 

5 

4 

3 

I 

0 

109 

no 

17 

15 

'  14 

13 

n 

10 

8 

7 

6 

5 

4 

2 

I 

no 

in 

18 

16 

15 

13 

12 

10 

9 

8 

7 

4 

3 

I 

in 

112 

18 

17 

15 

14 

12 

n 

10 

8 

7 

6 

5 

4 

2 

112 

"3 

19 

17 

16 

H 

13 

12 

10 

9 

8 

7 

5 

4 

3 

"3 

114 

19 

18 

16 

15 

14 

12 

n 

10 

8 

7 

6 

5 

4 

114 

"5 

20 

18 

17 

16 

H 

13 

12 

10 

9 

8 

7 

5 

4 

"5 

.  116 
117 

20 
21 

19 

g 

16 
17 

15 
15 

13 
14 

12 

n 
n 

10 
10 

8 
9 

I 

6 

7 

5 
6 

116 
117 

118 

21 

20 

18 

17 

16 

15 

13 

12 

n 

10 

8 

7 

6 

118 

119 

22 

20 

19 

18 

16 

15 

12 

n 

10 

9 

8 

7 

119 

120 

22 

21 

19 

18 

17 

16 

H 

13 

12 

n 

10 

9 

8 

120 

121 

23 

21 

20 

18 

17 

16 

15 

13 

12 

n 

10 

9 

8 

121 

122 
I23 

23 
24 

22 
22 

20 
21 

19 
19 

18 

18 

17 
17 

ii 

14 

14 

13 
13 

12 
12 

n 
n 

10 
10 

9 
9 

122 
123 

124 

24 

23 

21 

20 

19 

18 

16 

15 

14 

13 

12 

n 

9 

124 

I25 

24 

23 

22 

20 

19 

18 

i7 

I5 

14 

13 

12 

n 

10 

I25 

126 

25 

23 

22 

21 

20 

19 

17 

16 

15 

13 

12 

10 

126 

HI 

9 

24 
24 

23 
23 

21 
22 

20 
21 

19 
19 

18 
18 

16 
17 

15 
16 

H 
15 

13 
14 

12 
13 

n 
n 

127 
128 

129 

26 

25 

24 

22 

21 

20 

19 

17 

16 

15 

H 

13 

12 

129 

130 

27 

25 

24 

23 

21 

20 

19 

18 

17 

16 

15 

H 

.12 

130 

27 

26 

24 

23 

22 

21 

18 

17 

16 

15 

J4 

13 

I3I 

132 

26 

25 

23 

22 

21 

20 

19 

18 

16 

15 

14 

13 

132 

133 

28 

26 

25 

24 

23 

21 

20 

19 

18 

17 

16 

15 

14 

133 

134 

28 

27 

25 

24 

23 

22 

21 

19 

18 

17 

16 

15 

134 

135 

28 

27 

26 

24 

23 

22 

21 

20 

19 

18 

17 

16 

15 

135 

136 

29 

27 

26 

25 

24 

22 

21 

20 

19 

18 

17 

16 

15 

136 

137 
138 
139 

29 
29 
30 

28 
28 
28 

26 
27 
27 

25 

11 

24 
24 
25 

23 
23 
24 

22 
22 
22 

20 
21 
21 

19 

20 

20 

18 
19 
19 

txoo  co 

16 
17 
17 

!f 

16 

137 
138 
139 

140 

30 

29 

28 

26 

25 

24 

23 

22 

21 

20 

18 

17 

16 

140 

• 

36°.  o 

370.0 

38°-  o 

39°-o 

40°.  o 

41°.  o 

42°.  o 

0 

440.o 

45°-o 

46°.  o 

47°.  o 

48°.  o 

« 

23 


Vapor  pressure,  in  inches. 


s 

0 

3 

i 

O 

i 

fi 

s 

i 

i 

i 

i' 

ai 

gj 

g^. 

03 

S 

03 

£  . 

03 

c 

03 

c 

05 

's 

03 

S 

S-i 

a. 

X!  *-* 

1 

r  ~ 
t^  o 

8 

a. 

II 

a> 

a, 

II. 

•4 

Is 

0, 

i 

i- 

a. 

I 

o 
a, 

>,     " 

O 
PH 

h 

&, 

L    - 

I 

> 

0 

a, 

j 

O 
PL. 

• 

| 

cS 

Oj 

H     -, 

K05 

* 

cj 

cC 

a 

^ 

Q 

£> 

Z 

£> 

M 

£-! 

"* 

M 

^j 



• 

—30 

.0097 

0 

•  045 

30 

.166 

60 

•517 

90 

•408 

1  20 

3-  425 

—29 

.OIO 

I 

.047 

31 

•173 

61 

•536 

91 

•453 

121 

3-522 

-58 

.0018 

—28 

.Oil 

2 

.049 

32 

.180 

62 

•555 

92 

•499 

122 

3.621 

—57 

.0019 

—27 

.Oil 

3 

.052 

33 

.187 

63 

93 

•546 

123 

3-723 

-56 

.O020 

—26 

.012 

4 

•054 

34 

64 

•^5. 

94 

•595 

124 

•  3-827 

—55 
—54 

.0021 
•  OO22 

-25 
—24 

•013 
.013 

1 

•  057 
•  059 

$ 

.203 

.211 

65 
66 

.616 
.638 

95 
96 

•645 
.696 

"5 
126 

3-  933 
4.042 

—53 

.0024 

—23 

.014 

7 

.062 

37 

.219 

67 

.661 

97 

•749 

127 

4-154 

—52 

.O026 

—  22 

.015 

8 

-065 

38 

.228 

68 

.684 

98 

.803 

128 

4.268 

.O027 

—  21 

.016 

9 

.068 

39 

•237 

69 

.707 

99 

•859 

129 

4-385 

—50 

.0029 

—  2O 

.017 

10 

.071 

40 

.246 

70 

•732 

100 

.916 

130 

4-504 

—49 

•0031 

—19 

.018 

n 

.074 

.256 

71 

•757 

IOI 

•975 

4.627 

—48 

•0033 

—  18 

.018 

12 

•  078 

42 

.266 

72 

•783 

1  02 

•035 

132 

4-752 

—47 

•0035 

-17 

.019 

13 

.081 

43 

•277 

73 

.810 

103 

.097 

133 

4.880 

-46 

.0038 

—  16 

.020 

14 

-085 

44 

.288 

74 

-838 

104 

.100 

134 

5.011 

—45 

.0040 

—15 

.022 

15 

.088 

45 

.298 

75 

.866 

105 

-225 

135 

5-145 

—44 

.0043 

—14 

-023 

16 

.092 

46 

.310 

76 

:8^ 

106 

.292 

136 

5.282 

—43 

.0046 

—13 

.024 

17 

.096 

47 

-322 

77 

107 

-360 

137 

5.422 

—42 

.0048 

—  12 

.025 

18 

.  IOI 

48 

•334 

78 

•957 

108 

•431 

138 

5.  565 

—41 

.0051 

—  II 

.026 

19 

.105 

49 

•347 

79 

•989 

109 

-502 

139 

5-712 

—40 

•0054 

—  IO 

.028 

20 

.  no 

50 

•360 

80 

.022 

no 

2.576 

140 

5.862 

—39 

.0058 

—  9 

.029 

21 

.114 

51 

•373 

81 

.056 

III 

2.652 

-38 

.OO6l 

—  8 

•031 

22 

.119 

52 

•387 

82 

.091 

112 

2.730 

—37 

.0065 

—  7 

•032 

23 

.124 

53 

.402 

83 

.127 

113 

2.810 

-36 

.0069 

-  6 

•034 

24 

.130 

54 

.417 

84 

•163 

114 

2.891 

—35 

.0073 

—  5 

•035 

25 

•135 

55 

•432 

85 

.202 

"5 

2-975 

—34 

•  0078 

—  4 

•037 

26 

.141 

56 

-448 

86 

.241 

116 

3.061 

—33 

.0082 

—  3 

•039 

27 

.147 

57 

•465 

87 

.281 

117 

3-  H9 

—32 

.0087 

—   2 

.041 

28 

•153 

58 

-481 

88 

•322 

118 

3-239 

-3i 

•  0092 

—    I 

•043 

29 

•159 

59 

•499 

89 

•364 

119 

3-331 

Vapor 
Pressure 


24 


Correction  of  dew  point  for  pressure. 


i 

30"- 

29". 

28". 

27"' 

26". 

as". 

24". 

23"- 

22'  '  . 

2l". 

20". 

I9". 

18". 

5 

i 

.000 

.000 

+  •001 

+  .001 

+  .001 

+.002  +.002 

+.003 

4-003 

+.003  '+.004   +.004   +.004 

i 

2 

.000 

.000 

.001 

.002 

.002 

.003  ,    .004 

•005 

.006 

.007 

.007          .OO8 

.009 

2 

3 

—  .001 

.000 

.001 

.002 

.003 

.004 

.006 

.007 

.008 

.009 

.010  I     -on 

.012 

3 

I 

—  .001 

.000 

.002 

.003 

.005 

.006     .008 

.009 

•  Oil 

.012 

.014 

.015 

.017 

4 

5 

001 

-J-.  001 

.002 

.004 

.006 

.008  |     .010 

.012 

.014 

•  015 

.017 

.Oig 

.021 

5 

6 

—  .001 

.001 

.003 

.005 

.008 

.010  ;     .012  I     .014 

.016 

.019 

•  021 

.023 

.025 

6 

7 

001 

.001 

.003 

.006 

.009 

.012    i       -014    !       .017 

.019 

.022 

.024 

.027 

.030 

7 

S 

001 

.001 

.004 

.007 

.010 

.013    \      .016          .Oig 

.022 

.025 

.028 

.031 

•034 

S 

9 

—  .001 

.002 

.005 

.008 

.012 

•015    '       .Ol8           .022 

.025 

.028 

.032 

•035 

•038 

9 

10 

002           .  002 

.005 

.009 

.013 

.017    !       .020 

.024 

.027 

.031 

•035 

•039 

•043 

10 

1  1 

—  .002 

.002 

.006 

•  010 

.014 

.018           .022 

.026 

.031 

•035 

•039 

•043 

.047 

ii 

ta 

—  .003 

•  OO2 

.006 

•  OIO 

.015 

•Oig    '       -024 

.028 

.032 

•  037 

.041 

.046 

.050 

12 

'3 

—.003 

.002 

.006 

•  on 

.016 

.021           .026 

.030 

.040 

•045 

•050 

•055 

13 

1  4 

004 

.002 

.007 

•  012 

.017 

.  022          .  028 

•033 

.038 

•043 

.048 

•  °54 

•059 

14 

C5 

-.004 

.002 

.007 

.013 

.019 

.024    :      .030 

•035 

.041 

.046 

.052 

•058 

-063 

15 

1  6 

-.004 

•  OO2 

.008 

.OI4 

.020 

.026    i      .032 

•038 

.044 

.049 

•055 

.061  j     .067 

16 

i? 

-.004 

.002 

.008 

.015 

.021 

.027  !     .034 

.O4O 

.046 

•053 

•059 

.   .065  j     .072 

17 

18 

—.004 

.002 

.009 

•  016 

.022 

.029 

.036 

.042 

.049 

.056 

.062 

.069 

.076 

18 

19 

—  005 

•  OO2 

.009 

.017 

.024 

.031 

.038 

•045 

.052 

•059 

.066 

.  073       .  080 

19 

20 

—  005 

.003 

.010 

.018 

.026 

.033  1     .041 

.048 

•  055 

.063 

•  070 

.078       .085 

20 

21 

-.005 

.003 

•  on 

•  019 

.027 

.034        .042 

.050 

•  057 

.066 

•073 

.081        .089 

21 

22 

-.005 

.003 

.Oil 

.020 

.028 

.036  i     .044 

.052 

.061 

.069 

.077 

.085       .093 

22 

23 

—.005 

.003 

.012 

.021 

.029 

.038 

.046 

•°55 

.063 

.072 

•  08l 

.089 

.098 

23 

24 

-.005 

.004 

.013 

.021 

.030 

•039 

.048 

•057 

.066 

•075 

.084 

•093 

.102 

24 

25 

-.006 

.004 

.013 

•  O22 

.032 

.041 

.  050        •  060 

.069 

.078 

.088 

.097 

.106 

25 

26 

—.006 

.004 

.013 

.023 

•033 

.  043       .  052 

.062 

.072 

.081 

.091 

•  IOI 

.III 

26 

27 

—.006 

.004 

.014 

.024 

•034 

.044       .054       .065 

•  075 

.085 

•095 

.105 

•"5 

27 

28 

-.006 

.004 

.015 

.025 

.036 

i     .046 

•056 

.067 

.077 

.088 

.098 

.109 

.119 

28 

29 

—.007 

.004 

.015 

.026 

•  037 

•     -048 

.059  i     .069 

.080 

.091 

.  102 

•"3 

.124 

29 

30 

-.007 

.004 

•  016 

.027 

•  038 

'•     .049 

.061 

.072 

.083 

.094 

.105 

.117 

.128 

30 

31 

-.007 

.005 

.016 

•  028 

•039 

•  051 

.063 

.074 

.086 

.097 

.109 

.  121 

.132 

31 

32 

—.007      .005 

.017 

.029 

.041 

•053 

.065 

.077 

.089 

.  IOI 

•113 

•125 

•137 

32 

33 

—.007      .005 

.017 

.030 

.042 

!     -054 

.067 

.079 

.092 

.104 

.Il6 

.129 

.141 

33 

34 

-.008 

.005 

.018 

.031 

•043 

;     -056 

.069 

.082 

.094 

.107 

.  I2O 

•133 

•145 

34 

35 

—.008 

.005 

•  018 

.032 

•  045 

i     .058 

.071 

.084 

.097 

.  no 

.123 

•137 

-150 

35 

|6 

—.008 

.005 

.019 

.032 

•  046 

i     -059 

•073 

.086 

.  too 

.114 

.127 

.141 

•154 

36 

—  .008 

.006 

.019 

•033 

.047 

.061 

•075 

.089 

.103 

.117 

•131 

•145 

•  158 

37 

38 

—.009 

.006 

.020 

•034 

.049 

•063 

.077 

.091 

.106 

.  120 

•134 

.149 

.163 

38 

39 

40 

—.009 
-.009 

.006 
.006 

.021 
.021 

•035 
•  036 

.050 
.051 

.065 
.066 

.079 
.081 

.094 
.096 

.109 

.  Ill 

.123 
.126 

•138 
.142 

•153 
•157 

.167 
.172 

39 
40 

Dew  point 

Pressure 

Correction. 


— 


D     TO     .- 


SEP 


MAR  21 
JUtt  251 


JON  9    1960    S 


RECTO  UJ   MAY 


